1/2" Drive Broken Stud Screw Bolts Remover Extractor Removal Tool Kit 1/2"-3/4" Range Range: 6-19mm (1/4"-3/4") Remove studs, rounded nuts or bolts Hardened teeth with black oxide finish Use with 1/2" drive ratchet or 1/2 drive extention 10-inch wrench length : 250mm / 10 inches