Mayhew Pro 3-Piece Heavy Duty Brass Punch Set, 61365: * Alignment punches are used for aligning holes in metal pieces through which rivets, pins and bolts are inserted * Drift punches are used for aligning hardened steel or aluminum * Made of the highest quality American brass * Brass drift punch: 3/4" x 12" * Brass line-up punch: 3/8" x 10" * Brass line-up punch: 7/16" x 14" * Used for non-marring and non-sparking applications * Designed for use on harder surface materials which will not be damaged by the softer brass punches * Full lifetime warranty