With this thonging chisel from Oka of Japan, you can cut 20mm wide lacing slits in your leather. The cutting edge is smooth and curved for clean, professional-looking lacing slits, and the entire tool is hardened for additional toughness. The tool's handle is knurled for better control and grip, preventing it from slipping from your fingers while in use.This 20mm wide single prong thonging chisel is perfect for creating lacing holes in your leather. To avoid damaging the tool and your work area, use a soft-headed mallet and a cutting board (available separately) before punching.Available sizes (each sold separately):• 2mm• 3mm• 6mm• 8mm• 12mm• 20mm• 25mmPlease note: This tool is sharp, keep out of reach of children. Store without the tool making contact with any hard surfaces to avoid dulling the cutting edge.