This Michihamono leathercraft corner cutter is ideal for rounding the square corners of your leather. This professional tool is handcrafted in Japan by skilled artisans and is of outstanding quality. Crafted from heat-treated Blue Paper Steel (Aogami no. 2) , the same type of steel used in making Japanese swords and high-end cutting tools, and a Japanese zelkova handle that is ergonomically designed to fit in the user's hand, excellent tool for your leathercraft needs. This tool is razor sharp right out of the package and easy to sharpen when the blade edge gets dull.This 25mm corner cutter is excellent for ensuring you have the best possible rounded corner for your leatherwork. Always keep a cutting pad under your leathercraft project when using this punch to avoid damaging the cutting edge. Varying blade sizes (each sold separately) are available for removing leather corners of various sizes, depending on your demands.Approximate Dimensions & Product Data:• Blade Material: Blue Steel (Aogami No. 2)• Blade Length: 50mm• Blade Width: 25mm• 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 25mm(15R) 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 away from the reach of children.