SIZES: 2.5, 3, 4, 5, 6, 7, 8, 9, AND 10MM. DROP FORGED AND HEAT TREATED. The round hole punch is made of high steel, has a sharp round cutting edge, excellent wear resistance and durability, can make clean and precise holes, and can be used for a long time. The design of the knurled body makes the hollow punch with good slip resistance and firm grip, which helps to hold the hollow punch firmly and is easy to identify, which can ensure safe use. Just place the round hollow punch on the area where you need to punch, and then hit the back end firmly with a hammer or mallet. Different styles of punches can produce unique artistic and aesthetic effects on leather.