1.[Size]Leather hole punch sharpener has a length of 75mm/2.9in, an outer diameter of 3mm/0.1in at the tip, an outer diameter of 20mm/0.8in at the base, an inner diameter of 17mm/0.6in at the base, and a grinding range of 3 - 18mm/0.1 - 0.7in. 2.[Dual - head Design]Round Hole emery grinder has a conical shape with a double - ended design. The tip can be used to sharpen the inner edge of the punch, while the other rounded end can be used to sharpen the outer edge of the punch, sharpening both the inside and outside of the round punch in once, making it easy to use. 3.[Diamond Outer Layer]Conical polisher has a diamond layer on its surface that gives it excellent sanding and grinding properties, capable of sharpening and levelling rusty, dull and uneven punches. 4.[304 Stainless Steel Inner Core]The inner core of the Leather hole punch sharpener is made of selected 304 stainless steel, which has good hardness and abrasion resistance, and is sturdy and durable; the high - quality stainless steel material also has excellent corrosion and rust resistance that can be used for a long time.