THE CONTRACTOR'S CHOICE - WORLDWIDE. UNIQUE PUNCH PROFILE ALSO SPLITS SLUGS FOR EASIER SLUG REMOVAL. USE WITH BATTERY-POWERED HYDRAULIC RATCHET OR MANUAL DRIVERS. USES STANDARD GREENLEE DIES AND DRAW STUDS. SLUG BUSTER PUNCHES AVAILABLE IN SIZES UP THRU 2.52 IN (64.0 MM). U.S.PATENT #4543722 FOR SLUG-BUSTER.