10 pc Spiral Extractor and Drill Bit Combo Pack, 5 64 in, 7 64 in, 5 32 in, 1 4 in, 19 64 in, Metal Index Box no checkout Jam proof mechanism Retractable striking surface to Jam proof mechanism Retractable striking surface to prevent damage High carbon hardened steel working parts for"creased durability straight nose allows for use in narrow spaces not reachable by curved or straight jaws Use to clamp or tighten bolts or to extract items in hard to reach places the extractor's grip increases Extractor size and recommended drill bit size are etched on each tool socket screws and fittings Aggressive left hand spiral design for extra gripping power Spiral flutes are designed to embed themselves deeper into the metal as you turn the tool