Includes Pilot Punch sizes: 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8, 7/16, 1/2. Designed to apply equal pressure to the end of a pin driving it straight through the hole. The ball on the center of the point end assures proper contact with the pin eliminating damage to the pin or hole wall