IRWIN 48 Piece Master Extractor Kitwith Cobalt Left Hand Bits HA3101010 Remove nuts, bolts, studs that are rounded off, rusted, painted over or just impossible to remove. These extractors are made of high carbon steel with left-hand spiral teeth for maximum gripping power. Slim designs fit into recessed areas and can be used with a socket, wrench, of Vise-Grip 6 Spiral Flute Extractors EX-1, EX-2, EX-3, EX-4 , EX-5 , EX-6 13 Multi-Spline Extractors For use when higher torque or a lower profile tool is needed 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16" , 15/32", 1/2" 13 Bolt Extractors For use when part of the fastener is exposed 1/4", 5/16"-8mm, 3/8", 10mm, 7/16"-11mm, 12mm, 1/2", 13mm, 9/16"-14mm, 5/8" 16mm, 17mm, 11/16", 3/4"-19mm 16 Left-Hand Cobalt Drill Bits Use these to drill out the interior of the fastener. They often extract the fastener by themselves. 5/64", 7/64", 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 19/64", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2"