ROUND TYPE; 10 GAUGE MILD STEEL CAPACITY; STANDARD ROUND KNOCKOUT PUNCH UNIT USED ON ITEM; 730BB-1-3/4 USED ON ITEM PART NO; 1-3/4 INCH HOLE SIZE; 1-1/4 INCH CONDUIT/PIPE SIZE; APPLICATION PUNCH MILD STEEL, ALUMINUM, FIBERGLASS, PLASTIC ENCLOSURES