Pin Punches (Mayhew) Easy removal of spring or roll pins. Punches made of high grade S2 tool steel for superior tensile strength, toughness and long life. Shanks are fully heat treated, a two-step process in which the entire length of the tool is hardened and tempered; then the struck end is drawn back. This Mayhew exclusive process assures the struck end will be less susceptible to mushrooming. Made in USA.