Probst FMK Flexmarker Kit | Professional Curve Marking Tool for Paving & Landscaping

The Probst FMK Flexmarker Kit is one of the best curve marking tools on the market — an excellent example of a professional paving and landscaping layout system that makes a genuinely difficult task look straightforward. It’s a product our customers consistently come back to tell us they’re delighted with: smooth, accurate curves set out quickly, consistently and without the usual trial and error.

Minimum bending radius of just 15cm (6in). 10 fibreglass rods (1m each), 5 fixing claws and 10 clamps included. Two work modes — surface curve marking and dry concrete edge setting. Shows both horizontal curve and vertical profile. Complete kit weight 3.1kg — the Probst FMK Flexmarker is a professional-strength curve layout and marking tool equally at home setting out a sweeping driveway curve as it is defining tight borders, bed edges and free-form patio layouts.

We’re a small, family-run business — I’m Cleo, the owner, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a team of incredibly knowledgeable and caring individuals, and between us we’ve seen a lot of layout and setting-out tools come and go.

For setting out curved paving, curved pathways, curved patios, driveway curves, borders, bed edges and other free-form landscape features, the Probst FMK is our go-to recommendation. The flexible fibreglass rods connect together to create any shape required — from tight 15cm radius curves to large sweeping layouts — and can be secured with fixing claws weighted with paving stones on existing surfaces, or fixed to pins in dry concrete to define both the curve and the vertical profile. If you’re wondering how to mark out a curved path, how to set out curves for paving, or how to create smooth curves in landscaping, the FMK is the tool that makes it simple.

Key Selling Points

• Create free-form curves — set out tailor-made curves rather than being restricted to fixed-radius templates
• Minimum 15cm bending radius — handles tight curves as well as sweeping landscape layouts
• Two work modes — surface marking with spray paint or chalk, or edge setting in dry concrete
• Shows vertical profile — when used with pins and clamps, defines both the curve and the finished height
• Significant time savings — in our experience, a purpose-built curve marking system is consistently faster than improvised methods
• Secure on hard surfaces — fixing claws can be weighted with paving stones to hold rods firmly in place
• Reusable professional system — rods, claws and clamps form a durable kit used across multiple projects
• Lightweight — complete kit weighs just 3.1kg, practical for moving between jobs

Who Uses the Probst FMK Flexmarker Kit?

Paving Contractors & Landscaping Professionals

The FMK Flexmarker is our recommendation for paving contractors and landscaping teams who regularly work on curved paths, patios, driveways and borders. Setting out curves accurately — particularly tight radius curves or long sweeping layouts that need to flow naturally — is one of the more time-consuming parts of any curved paving project. The FMK removes the guesswork, allowing contractors to mark curves quickly using spray paint or chalk and move straight to laying. In our view it’s a complete solution for shaping and marking curves, delivering dynamically shaped paths without visual interruptions and real time savings on layout.

Patio Installers & Driveway Installers

Patio installers and driveway installers use the FMK when working on curved paving layouts where setting-out accuracy directly affects the quality of the finished job. Whether it’s a curved driveway apron, a shaped patio edge or a curved step run, the FMK gives a reliable, repeatable curve that can be marked with spray paint before any material is moved. Its minimum 15cm bending radius means even tight radiused patio and driveway curves can be set out accurately.

Landscape Gardeners & Garden Designers

Landscape gardeners and garden designers use the FMK to translate drawn plans into accurate on-site curves for garden paths, curved borders, bed edges and other free-form landscape features. The 15cm minimum bending radius means even tightly curved designs can be set out accurately on the ground, and the system’s lightweight construction (3.1kg complete) makes it easy to carry and reposition across a site.

Hard Landscaping & Groundworks Contractors

Hard landscaping and groundworks contractors working on larger residential or commercial schemes use the FMK for setting out curved kerb lines, path edges, retaining edges and one-liner bed and path edges in dry concrete. Work Mode 2 — fixing the rods to pins with the included clamps — means the FMK functions as both a curve guide and a vertical profile guide throughout the laying process, removing the need for additional height gauges.

DIY Homeowners

The FMK is also suitable for homeowners tackling curved paving projects — whether that’s a curved driveway, a winding garden path, a shaped patio or a border edge. If you’re unsure how to mark out a curved garden path or how to create accurate curves in paving, the FMK makes the process simple. If you’re not sure whether it’s the right tool for your project, contact us or call 0330 122 1025 — we’re always happy to help.

Why Use the Probst FMK Instead of a Hose or Plastic Pipe?

For many contractors, curved paving is marked out using whatever is available on site — often a length of plastic pipe, hose or similar flexible material. While this can work for a one-off curve, it can be difficult to control and reproduce the same shape accurately, particularly when a project involves multiple curves or a high-quality finish is required.

The FMK is purpose-built for the job. Its connectable fibreglass rods can be formed into tailor-made curves, secured in position with fixing claws and then marked with spray paint or chalk. The fixing claws can also be weighted with paving stones to keep the curve securely in position on an existing surface.

A hose or plastic pipe can be a useful quick fix, but it doesn’t give you a dedicated system for setting out curves. The FMK provides a more controlled way to establish the shape before you start cutting, excavating or laying paving. For professional contractors, that consistency matters — a curve that looks right at the start of a job can easily become uneven or change shape as you move along it. With the FMK, the rods can be positioned, adjusted and securely fixed before the line is marked, giving the installer a defined curve to work to.

That makes it particularly useful when setting out curved driveways, paths, patios, borders and other hard landscaping features where the finished curve needs to look deliberate rather than improvised.

Built for Repeatable Professional Work

The big advantage of the FMK for landscaping and block paving contractors is that it turns curve setting-out from an improvised process into a proper part of the installation. You can create the curve, check the shape, make adjustments and then mark it out before committing to the installation — especially useful on larger projects or when several curves need to follow a consistent style. For contractors who regularly install curved paving and landscaping, the PROBST FMK Flexmarker is a purpose-built alternative to using bits of hose or plastic pipe, giving you a more controlled, secure and repeatable way to set out curves before the work begins.

How Does the Probst FMK Flexmarker Work?

The FMK uses interconnected flexible fibreglass rods to form the required curve. The rods connect end to end to create a continuous flexible line that can be shaped to any curve with a radius down to 15cm. Once positioned, the system can be used in one of two ways:

Work Mode 1 — Surface Curve Marking

The connected rods are laid onto the existing pavement or ground surface and fixed in position using the included fixing claws, which are weighted with paving stones to hold the system securely — including on hard surfaces. Once the curve is set correctly, it is marked using spray paint or chalk. This mode is ideal for marking curved paving layouts, curved path layouts, curved patio edges and driveway curves before work begins.

Work Mode 2 — Dry Concrete Edge Setting

For path and bed edges where a one-liner edging is to be laid in dry concrete, the rods are fixed to setting-out pins using the included clamps. In this mode the FMK not only defines the curve in plan but also shows the vertical profile, acting as both a curve guide and a height guide throughout the laying process. This is particularly useful for curved path edging, curved border edging and bed edge installation where the finished height needs to be controlled as well as the line.

Features & Benefits

• Professional curve marking and layout tool — PROBST Site Equipment / Professional Tools range
• Minimum bending radius 15cm (6in) — tight curves and large sweeping layouts
• 10 fibreglass rods (1m each) — 10 metres of rod per kit
• 5 fixing claws — surface fixing, weighted with paving stones (Work Mode 1)
• 10 clamps/binders — pin fixing for dry concrete edge setting (Work Mode 2)
• Defines horizontal curve and vertical profile (Work Mode 2)
• Spray paint or chalk marking — compatible with all standard marking methods
• Creates smooth, harmonious curves without visual interruptions
• Significant time savings over improvised curve marking methods
• Secure on hard surfaces — claws weighted with paving stones
• Lightweight — 3.1kg complete
• Durable and reusable across multiple projects
• Suitable for paving, pathways, patios, driveways, borders, bed edges, kerb lines and curved edging
• FREE delivery

Technical Specification

Frequently Asked Questions about the Probst FMK Flexmarker Kit

I’m Cleo, owner of The Paving Experts, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a small team of incredibly knowledgeable and caring individuals who share the same passion for getting it right. The FAQ answers below come from the questions we’re asked every single day.

What is the Probst FMK Flexmarker Kit?

The Probst FMK Flexmarker Kit is a professional curve marking and layout system used to create and mark tailor-made curves for landscaping, paving, pathways, borders and other curved landscape features. It uses interconnected flexible fibreglass rods to form any curve required, from a 15cm tight radius to large sweeping layouts.

What is a Flexmarker used for?

A Flexmarker is used to set out and mark free-form curves quickly and accurately. The Probst FMK can be used for curved paths, bed edges, borders, patios, driveways and other landscaping layouts where a smooth, continuous curve is required.

How does the Probst FMK work?

The FMK uses interconnected flexible fibreglass rods to form the required curve. Fixing claws hold the rods against an existing surface — weighted with paving stones — so the curve can be marked with spray paint or chalk. Alternatively, the system can be fixed to pins using the included clamps when setting out path and bed edges in dry concrete, where it also shows the vertical profile.

What is the minimum bending radius of the Probst FMK?

The Probst FMK has a minimum bending radius of 15cm (6 inches), allowing contractors to create tight curves as well as larger sweeping curves.

Can the Probst FMK be used for curved paving?

Yes. The FMK is designed for creating and marking tailor-made curves and is particularly useful when setting out curved paving, paths, patios, driveways, borders and other landscaping features.

Can the Flexmarker be used to mark a curved path?

Yes. The fibreglass rods are connected to form the desired curve and secured to the existing surface using the fixing claws, weighted with paving stones. The curve is then marked using spray paint or chalk, giving a consistent, smooth line to work to.

Can the Probst FMK be used on existing paving?

Yes. The FMK can be laid directly onto existing paving or another hard surface, with the fixing claws weighted with paving stones to hold the system securely in position.

Can the Probst Flexmarker be used on hard surfaces?

Yes. The fixing claws can be placed on existing hard surfaces and weighted with paving stones to prevent the connected fibreglass rods from moving while the curve is marked.

Can the FMK be used for path and bed edges?

Yes. The FMK can be fixed to pins using its clamps when setting out path and bed edges in dry concrete. In this application it indicates both the curve and the vertical profile, making it a useful tool for one-liner edge laying.

Can the Flexmarker show the vertical profile?

Yes. When used with pins and clamps for path or bed edges, the FMK can show both the required curve and the vertical profile. This makes it particularly useful when setting out edges that need to follow a controlled level as well as a curved plan.

How many fibreglass rods are included in the Probst FMK?

The Probst FMK includes 10 fibreglass rods, each 1m long, giving 10 metres of rod length in total.

How many fixing claws are included?

The FMK kit includes 5 fixing claws, used to secure the connected fibreglass rods when laying out curves on an existing surface.

How many clamps are included with the FMK?

The standard FMK kit includes 10 clamps, used when fixing the system to pins for applications such as setting out path and bed edges in dry concrete.

How much does the Probst FMK weigh?

The complete Probst FMK has a dead weight of 3.1kg, making it lightweight and practical to transport between jobs.

Can the Probst FMK be used for patios and driveways?

Yes. The FMK is suitable for setting out free-form curves for curved patios, curved driveways, curved paths, borders and other hard landscaping layouts.

Does the Probst FMK save time?

In our experience, yes — a purpose-built curve marking system is consistently faster than improvised methods. The FMK allows you to create the curve, check the shape and mark it out before committing to the installation, which removes a lot of the back-and-forth that comes with using whatever happens to be on site.

How is the Probst FMK different from using a garden hose or plastic pipe?

A hose or plastic pipe can work as a quick fix for a one-off curve, but it doesn’t give you a dedicated system for setting out curves accurately or repeatably. The FMK provides a more controlled approach — the rods can be positioned, adjusted and securely fixed before the line is marked, giving the installer a defined curve to work to. A hose or pipe is difficult to hold in position accurately while marking and can change shape as you move along it; the FMK stays where you put it. It also can’t function as a vertical profile guide, which the FMK can when used with pins and clamps in dry concrete applications. For contractors who regularly install curved paving and landscaping, the FMK turns curve setting-out from an improvised process into a proper, repeatable part of the installation.

How to Mark Out and Set Out Curves — Common Questions

How do you mark out a curved path?

The PROBST FLEXMARKER-KIT FMK is our recommended tool for marking out curved paths. Its flexible fibreglass rods can be shaped into tailor-made curves, secured in position and marked with spray paint or chalk. The system is designed to create dynamically shaped paths without visual interruptions, and in our experience it delivers significant time savings compared to improvised methods. The kit includes 10 fibreglass rods (1m each), 5 fixing claws and 10 clamps, with a minimum bending radius of 15cm (6in) and a complete kit weight of 3.1kg.

What is the best tool for marking out a curved path?

In our view, the PROBST FLEXMARKER-KIT FMK is the best purpose-built tool for marking out curved paths. Its flexible, interconnecting fibreglass rods — with a minimum bending radius of 15cm (6in) — can be shaped into tailor-made curves, secured in position using the 5 fixing claws, and the line marked with spray paint or chalk. The complete kit weighs 3.1kg and includes 10 fibreglass rods and 10 clamps.

How do you mark out a curved patio?

The PROBST FMK can be used to mark out a curved patio by shaping its flexible fibreglass rods to the required curve and securing them on the existing surface with the fixing claws. Once the curve is in position, it can be marked using spray paint or chalk. The fixing claws can be weighted with paving stones to keep the curve securely in place.

How do you set out a curved paving edge?

The PROBST FLEXMARKER-KIT can be used to set out a curved paving edge by fixing the system to pins using its clamps. It can show not only the curve but also the vertical profile, making it useful for setting out curved path and bed edges before laying the paving.

How do you create a smooth curve in paving?

A flexible curve layout tool such as the PROBST FMK allows you to shape the curve before marking it out. The interconnected fibreglass rods can be formed into smooth, tailor-made curves, allowing the layout to be adjusted before the final line is marked.

How do you mark a radius for landscaping?

The PROBST FMK is designed specifically for creating and marking tailor-made curves and radii. Its flexible fibreglass rods can be shaped to the required layout, with a minimum bending radius of 15cm (6 inches). Once positioned, the curve can be marked with spray paint or chalk.

How do you set out curved garden borders?

The FMK can be used to set out curved garden borders by shaping the flexible rods to the desired line and securing them in position. When used with pins and clamps, the system can also show the vertical profile as well as the curve, which is useful when establishing curved bed and border edges.

How do you create a free-form paving curve?

The PROBST FLEXMARKER-KIT is designed for creating free-form, tailor-made curves. The interconnected fibreglass rods can be arranged into the required shape, secured with the fixing claws and then marked with spray paint or chalk. This allows the curve to be adjusted before the paving or edging work begins.

What tool can I use to mark curved paving?

We recommend the PROBST FLEXMARKER-KIT FMK for setting out curved paving and landscaping layouts. It uses flexible fibreglass rods that can be shaped to the required curve and then marked onto the existing surface.

What is the best way to set out a curved garden path?

In our experience, using a purpose-built flexible curve layout system is the most controlled and repeatable way to establish the shape before construction begins. The PROBST FMK allows the curve to be formed using interconnected fibreglass rods, which can then be secured and marked with spray paint or chalk — significantly faster and more consistent than using improvised materials.

How do you create accurate curves in hard landscaping?

For accurate hard landscaping curves, we recommend forming the layout first using a flexible curve marking system such as the PROBST FMK. The rods can be shaped and secured in the required position before the curve is marked, allowing the layout to be checked and adjusted before work begins.

How do you mark out a curved driveway?

The PROBST FMK can be used to create and mark a curved driveway layout by shaping its flexible fibreglass rods to the required line. The rods are secured to the existing surface using the fixing claws and can then be marked with spray paint or chalk.

How do you set out a curved border?

The FMK provides a simple way to set out curved borders by forming its flexible rods into the required shape. The rods can be secured using the fixing claws on an existing surface, or fixed to pins using clamps when setting out path and bed edges in dry concrete.

What is a landscaping curve marker?

A landscaping curve marker is a tool used to create and mark curved layouts for features such as paths, borders, beds and paving. The PROBST FLEXMARKER-KIT FMK uses flexible fibreglass rods that can be shaped into tailor-made curves and marked onto an existing surface using spray paint or chalk.

What is a paving curve marker?

A paving curve marker is a tool used to set out the line of a curved paving feature before installation. The PROBST FMK is our recommended tool for this type of layout work, allowing contractors to create tailor-made curves and mark them accurately onto an existing surface.

For further information or to speak to a member of our team, contact us or call 0330 122 1025 — we’re a small, family-run business and always happy to help.

• Brand: Probst
• SKU: TPE-PRBSTFMK
• Weight: 20.0 kg / 44.09 lb