Leather Thonging Chisel Punch 7 Piece Set The Leather Thonging Chisel Punch 7 Piece Set is designed with removable lacing slit hole tips. This punch set makes it easy to punch precise holes and prepare your leather projects for lacing. The set includes a handle plus 6 interchangeable heads, including 1 and 3 prong punches at 1.5 mm, 1 and 3 prong punches at 2.5 mm, and 1 and 3 prong punches at 3 mm, allowing you to change the heads to best suit your project needs. The punch prongs produce a 1.5, 2.5 or 3 mm slot hole. A Leather Thonging Chisel Punch is a crucial tool in leatherworking designed specifically to create uniform, straight slots (slits) in leather, allowing for the passage of leather lace or wide stitching thread. Unlike standard round hole punches, these chisels are used to prepare edges for decorative or high-strength lacing. Recommended for use with our leather punching mat and heavy leather mallet