Designed for use in aligning holes in metal pieces through which pins, rivets or bolts are inserted. Hardened and tempered for maximum strength and durability. Smooth finish and corrosion resistance. Made in the U.S.A.. Lifetime warranty 3 piece line up punch set is made in the U.S.A. Designed for use in aligning holes in metal pieces through which pins, rivets or bolts are inserted. They are not designed to be used for driving. Like all SK punches, our line up punches are hot forged in America from premium alloy steel. SK punches are hardened and tempered for maximum strength and durability, plus individually ground, polished and coated for a smooth finish and corrosion resistance. Set includes: 5/16", 3/8" and 1/2". Packaged in a pouch.