Sumnacon Leather Craft 4mm 1/2/4/6 Prong Metal DIY Diamond Lacing Stitching Chisel Set / Leathercraft Hand Working Tools Hole Punch Lacing Stitching Perforate Adopt high strength metal, it is tough in structure, versatile, sharp. These are extremely sharp, please use caution and care while using these. And do not drop or let them fall on the floor,Or the prong will broke.Pls put leather on soft cushion when use hole punch Each prong is 2mm wide, and the space between the tips of each prong is 4mm.(Prong width:Approx 2mm, Prong pitch:Approx 4mm) The ease of making evenly spaced, uniform holes.The finished product is the best looking stitching.They're easy enough to remove from the material, but be careful not to twist the chisels too hard while removing them. Package: 1 Prong/ 2 Prong/ 4 Prong/ 6 Prong