Size: 12mm leather hole punch for punching precision smooth holes in thick fabrics, leather belts, and straps. Shank Dia: 6.35mm; Total Length: 74mm.This hardened punch is made of heat-treated carbon steel, strong and durable. Special design, chip removal fast to make nice clean cuts.Hex shank hollow punch work with power drills or drill presses can easily cut through multiple layers of fabric.Widely used for punching in leather, paper, soft plastic, rubber, PVC board, clothes, shoes, canvas, and other materials.Note: Use a backer board (plywood/soft gasket) during the punching operation, avoiding cutting into your workbench.