Size: Total length 100mm Pitch: 3mm Quantity: Set of 4 (1, 2, 4, and 6 prongs) The 1 and 2 prong tools are suitable for punching holes in curved sections, while the 4 and 6 prong tools are suitable for punching holes in straight sections. Place the diamond chisel vertically on the leather and strike it with a hammer or similar tool. To prevent rust, oil has been applied in advance, so please wipe it off before use. Due to the nature of the tools, there may be small scratches or stains. Please understand this before purchasing. Uses: Leathercraft