Line-Up Punches (Mayhew) For aligning and sizing holes. 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.
