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Features: Material:Chrome vanadium steel Package Included: 5 x Screw Extractor Size: 1/8(3-6mm) 3/16(6-8mm) 15/64(8-11mm) 5/16(11-14mm) 3/8(14-18mm) How to use it? 1. At first, you need to drill a hole in the center of damaged drill. 2. Secondly, insert the screw extractor, turn it by anticlockwise with wrench, untill the Screw Extractor can to bite your damaged drill are stable, then bolt can be extracted. 3. In addition, this item Can also be used as a hexagon screwdriver to use, to tighten loosed screws. Note: This repair tool is not guaranteed to remove all the broken screws, according to the actual situation.Please understand before you purchase it, thank you so much.