Seiwa Pro Tool Diamond Hole Punch, 4mm width, 3 prongs. Brand new, unused. Total length approximately 110mm. 1. "Heat treatment" is applied, preventing "bending and deformation" of the blade tip. 2. "Carefully polishing" the blade creates "exceptional sharpness." 3. By adding an "R" to the blade groove, strength and durability are given to the blade tip, allowing holes to be made easily 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.