Product details:

Replacement punch for unit 234 Cut-out and mounting slots are punched in one operation Fast, accurate panel punching with no sawing or filing required Drill only one 7/16-Inch (11.1 mm) pilot hole Punch up to 16 gauge mild steel or 10 gauge aluminum The Greenlee 34427 Punch Pin (37) (234) is part of Greenlee's premium collection of tools and accessories. This connector pin punch unit is designed to drill only one 7/16 pilot hole, with fast, accurate panel punching, and no sawing or filing required.