GearWrench Universal Nut Cracker 7/16 Inch to 3/4 Inch

Removes broken studs, set screws, pipe, and grease fittings;Drill hole in broken studs with left-hand bit, seat the extractor in hole, tap lightly with a hammer to seat, turn counterclockwise with a tap wrench to remove;Features undercut flutes for a more positive grip