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