【Size】Includes 6 tools, 1 1/4 inch quick change chuck and 5 coin extractors: #1. 1/8-1/4 inch (M3-M6), #2. 1/4-5/16 (M6-M8), #3. 5/16-7/16 (M8-M11), #4. 7/16-9/16 (M11-M14), #5. 9/16-3/4 (M14-M19) 【Design】 Quick-action helix assists in screw removal, 1/4 hex shank fits more easily and securely into all power tools, specially designed to lock into quick-change chucks 【Strong applicability】 This screw extractor can effectively solve the problem of broken head screws, screw thread, rusty screws, which can help you in many areas. 【Application】 The disassembly screw extractor quickly and effectively damages screws and nuts. It will bring more convenience to your daily work in auto repair, home decoration, handicraft production, etc. 【Special Design】The reverse screw extractor set easily removes screws, bolts, bolts and threaded pipe fittings