With this large, high-quality, Japanese-made 40mm leathercraft corner punch by Michihamono, you can round the square corners of your leather. Because this leather corner cutter has a sharp edge, you won't need a hammer to remove the corners; instead, you can slice all the way through your leather with one or both hands. Blue Steel (Aogami No. 2) was used to create the blade of this tool, which is recognized for its sharpness and durability. Blue steel has a lower amount of impurities than white steel, as well as more chromium and tungsten, making this tool more resistant to wear and tear. The handle is constructed of high-quality Japanese zelkova wood, which is both smooth and comfortable to grasp and use.This round corner punch is perfect for quickly rounding your leather corners. For all your leathercrafting needs, we have a variety of sizes available (each sold separately). Always put a cutting mat under your leather while using this tool to avoid damaging the cutting edge.Approximate Dimensions & Product Data:• Blade Material: Blue Steel (Aogami No. 2)• Blade Length: 50mm• Blade Width: 40mm• Handle Material: Japanese Zelkova• Handle Length: 110mmAvailable Sizes (each sold separately):• 4.5mm (3R)• 9mm (5R)• 12mm (10R)• 25mm (15R)• 40mm (25R)The "R" in the size indicates the radius (mm) of the round cutting edge.This listing is for the 40mm (25R) punching tool only. The leather materials and other tools shown are for illustrative purposes only.Please Note: The cutting edge of this tool is sharp, keep out the reach of children.