Leather Diamond Hole Punch 3mm Pitch 4-Piece Set Leather Craft Tool Size: Total Length 100mm Pitch: 3mm Quantity: 4-piece set (1, 2, 4, and 6 prongs) The 1 and 2 prong punches are suitable for punching holes in curved sections, while the 4 and 6 prong punches are suitable for punching holes in straight sections. Place the diamond hole punch 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 purchase only if you understand this.