If you’ve been wrestling with inaccurate layout marks and crooked arcs, the is the sort of gadget that actually makes the job feel easier — it’s a 300 mm radius, chisel‑tipped compass built for scribes and arcs where precision matters. The bottom line is this tool isn’t some flimsy layout wheel; it’s a proper shop‑grade layout compass with dual arms that hold their settings.

What really stands out is how this tool lets you set a radius, lock it down, and then hit that same circle or arc over and over without the damn thing walking out of position — that’s thanks to its locking screw mechanism and solid construction. In practice, that means fewer mistakes on wood, metal, drywall or panel work and less time cleaning up botched layout lines.

Key Features:

• 300 mm Maximum Radius – Lets you scribe circles and arcs up to about a foot across with confidence.
• Dual Chisel Tips – Sharp, hardened points give a clear center and edge mark, so your layout lines are clean.
• Locking Screw Adjustment – Keeps your radius set tight so you don’t lose your mark mid‑job.
• Reinforced Metal Arms – Stiff, straight arms resist bending even after being knocked around on site.
• Ergonomic Balance – Handles feel decent in the hand, which matters when you’re doing layout all day long.

Applications

This compass isn’t some one‑trick pony — it’s a proper layout tool for any task where you need to draw or transfer radii up to 300 mm. Block builders use the chisel compass to mark bolt holes, cut circles in plywood, or lay out patterns on metal. Carpenters will swear by it for door circle cut‑outs, stair components, or joinery layouts. Sheet metal folks use it to scribe arcs before bending. And yes, in renovation work it’s a godsend for marking where fixtures or holes need to land.

Why Choose This Model

Here’s the thing — you’ve probably used cheap compasses that twist out of calibration with the slightest bump. The Stanley FATMAX Chisel Compass doesn’t feel like one of those. Its locking adjustment is positive, the arms don’t flex, and the whole thing stays put on both setup and repeat passes. That matters a lot on a jobsite where you don’t get a second shot at a messed‑up circle in plywood or sheet metal. It’s a simple tool, but the feel and control make a genuine difference.

Technical Specifications Explained

• Maximum Radius – 300 mm – Defines how big a circle you can lay out with this compass.
• Construction – Reinforced Metal Arms – Gives strength and straightness so the compass doesn’t flex under clamping force.
• Adjustment – Locking Screw Mechanism – Locks your radius in once you set it, preventing slippage during marking.
• Chisel Tips – Hardened Points – Tough, sharp points that bite into wood or metal for accurate centering and arc lines.
• Finish – Corrosion‑Resistant Coating – Helps slow rusting so the tool lasts longer in a sweaty kit or truck box.

Who Should Buy This

If you’re a tradesperson, fabricator, cabinet maker, or serious DIYer who frequently deals with layouts and arcs, the 300 mm chisel compass is one of those tools you’ll find yourself grabbing more often than you expect. It’s affordable, stout, and doesn’t feel like junk out of the box.

But more importantly — if you’ve ever cursed a radius layout that kept slipping on you, this compass fixes that problem without making you dig way deep into your wallet.