POLARIS 3478 Commercial Leather Punch (0.06 inch (1.5 mm)): For repairing, reinforcing and manufacturing various types of leather, cardboard, vinyl, cloth, rubber, etc. Made with special steel SK-4 and hardness HRC58±2, this blade is specially finished to withstand professional use. Made in Japan for peace of mind. With excellent sharpness at the edge of the blade, you can drill holes without using a hammer, just turn it by hand and push it in. When using the hammer, place the punch vertically and hammer the head with a hammer. Hole Diameter: 0.06 inches (1.5 mm); Blade Hardness: HRC58±2; Material: Special blade steel SK-4