Seiwa Pro Tool Diamond Hole Punch, 3mm width, 3 prongs. Brand new, unused. Total length approximately 110mm. 1. "Heat treatment" is applied, preventing the blade tip from "bending" or "deforming." 2. "Carefully polishing" the blade creates "exceptional sharpness." 3. The "R" shape on the blade groove provides strength and durability to the blade tip, allowing you to easily punch holes even in thick leather. 4. The sharp blade tip creates beautiful diamond-shaped holes. 5. The handle has a checkered non-slip grip to prevent slipping when holding the diamond punch. \* The spacing between the blades is expressed in width (pitch/mm). It is also stamped on the handle. SEIWA Pro Tool Diamond Hole Punch 3mm width, 3 prongs, hand sewing hole punching tool. This is a tool for punching holes for hand-sewn stitches.