Features and Benefits: Original Mayhew patented design with a rounded end that fits snuggly within a roll pin; Also known as a roll pin punch; Standard SAE measurement; 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; This Mayhew Pro 3/8 in.; #10 Pilot Punch is used to drive in and remove roll pins or other hollow tension pins.