Leathercraft 1/2/4/6 Prong Diamond Chisel(black) Prong Width:Approx 2mm, Prong pitch:Approx 4mm Material: high quality steel Knurled Body for a Stronger, Steadier Grip One sharp rhombus tooth is helpful to punch quickly and effortlessly Widely use in punch holes in a precise diamond shape that is optimal for stitching leather