Which Size Edge Beveller Should You Use? A Guide to Matching Tools to Leather Thickness

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

Why Edge Bevelling Matters

Before we 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 your 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 quality from mass production.

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. Most leatherworkers will find they 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 arguably the most versatile beveller in the kit. It's the go-to for anything in the 1–1.5mm range and 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 workhorse size for most mid-weight projects. At 1.5–2.5mm, leather has enough body to take a confident bevel without the risk of 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 will darken and harden 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 with leather 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. This is particularly important on belts — a thin bevel on a 3.5mm belt 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 can be burnished flat and smooth. Anything smaller will look lost on the edge.

#5 — Extra Heavy (5mm+ / 10 oz+)

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

Most craft leatherworkers won't reach for a #5 often, but if you're working with very thick leather — particularly on saddle panels or harness components — it's the right tool. The chamfer needs to be proportionate to the leather body, and a #5 delivers that.

A Few Rules of Thumb

Bevel both sides. Always bevel the grain side and the flesh side. The flesh side is often forgotten but makes a significant difference to the finished feel and burnish.

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

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

Consider the project context. A delicate bracelet and a heavy belt might both be 2mm thick, but the bracelet may benefit from 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 will develop over time. 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 your customers will notice — even if they can't quite articulate why.