How to choose the Right size Beveller: A Guide to Matching Tools to Leather Thickness

One of the most overlooked details in leatherworking is the edge bevel. Get it right and the piece looks polished and considered. Get it wrong and you're left with either a barely-there chamfer or an aggressive cut that eats into the leather. Here's the straightforward guide I wish I'd had - matching beveller size to leather thickness.

Why Edge Bevelling Matters

Before I get into the numbers, it's worth understanding what an edge beveller actually does. It removes the sharp 90° corner from the flesh and grain sides of the leather, creating a small chamfer that's easier to burnish, less prone to cracking, and far more comfortable against skin. On a finished piece - a belt, wallet, or bracelet - a well-bevelled edge is one of those details that separates handcrafted work from mass production, and it's usually the first thing I check on a piece before it leaves my bench.

Understanding Beveller Sizes

Edge bevellers are typically numbered from #0 (or #00) through to #5 or #6, depending on the brand. The number corresponds to the width of the cutting blade - the higher the number, the wider and deeper the cut. In my own kit, I reach for sizes #1 through #3 the most.

The Guide: Beveller Size by Leather Thickness

#0 / #00 — Very Fine (Under 1mm / Under 2–3 oz)

Best for: lining leathers, skived edges, thin veg-tan or chrome-tan used in wallets and card holders.

At this thickness, you're barely removing material. A #0 takes the sharpest edge off without risking cutting through to the other side. Use a light touch and let the tool do the work.

#1 — Light (1–1.5mm / 2–4 oz)

Best for: wallet panels, watch straps, thin belt linings, bracelet inners.

The #1 is probably the most versatile beveller I own. It's the one I go to for anything in the 1–1.5mm range, and it produces a clean, proportionate chamfer that burnishes beautifully with a wood slicker or bone folder.

#2 — Medium (1.5–2.5mm / 4–6 oz)

Best for: belts, bag straps, notebook covers, coasters, keychains.

This is the size I reach for most in my own workshop - the workhorse for most mid-weight projects. At 1.5–2.5mm, leather has enough body to take a confident bevel without the tool skipping or digging in. A #2 gives a chamfer that's visible and satisfying to burnish, particularly on vegetable-tanned leather where the edge darkens and hardens beautifully over time.

#3 — Medium-Heavy (2.5–3.5mm / 6–8 oz)

Best for: heavy belts, bag bodies, holsters, saddlery, thick wallet spines.

Once you're working above 2.5mm, a #2 starts to look a little timid. A #3 gives a bolder chamfer that's in proportion with the thickness of the piece - I've found this especially true on belts, where a thin bevel on a 3.5mm strap just looks unfinished.

#4 — Heavy (3.5–5mm / 8–10 oz)

Best for: saddlery, heavy-duty straps, dog collars, thick holsters.

At this weight you're typically working with bridle leather or thick veg-tan. A #4 removes enough material to create a proper chamfer that burnishes flat and smooth. Anything smaller looks lost on the edge.

#5 — Extra Heavy (5mm+ / 10 oz+)

Best for: saddlery, harness work, heavy straps, and structural pieces.

I don't reach for a #5 often, but on very thick leather - saddle panels or harness components - it's the right tool for the job. The chamfer needs to stay proportionate to the leather body, and a #5 is what delivers that.

A Few Rules of Thumb

Bevel both sides. Always bevel the grain side and the flesh side. The flesh side gets forgotten more often than it should, but it makes a real difference to the finished feel and burnish.

Sharp tools only. A dull beveller tears rather than cuts. I strop mine regularly on a leather strop loaded with compound.

Test on a scrap first. If you're torn between two sizes, cut a scrap from the same hide and test both. The right size will feel obvious once you try it.

Consider the project context. A delicate bracelet and a heavy belt might both be 2mm thick, but the bracelet often suits a #1 for a more refined look, while the belt suits a #2.

Final Thoughts

There's no single "correct" answer - leatherworking is a craft, and your eye develops over time. Mine still is. But using this guide as a starting point will save you from the common mistake of under-bevelling thick leather or over-cutting thin pieces. A well-bevelled, well-burnished edge is one of the hallmarks of quality handcrafted leather goods, and it's a detail people notice even when they can't quite say why.