Remove Any Stripped Screw In Three Easy Steps: DRILL, FLIP, EXTRACT! APPLY TO ALL DRILLS : 4 pieces screw extractors work with any drill and all the screw size or bolt (3-12mm), These extractor tools are used to reverse the damaged screw counterclockwise until it is released POWERFUL : Striped screw extractor removes even the most stubborn stripped, damaged, embedded, rusted and painted-over screws and bolts EASY TO USE : Just two simple steps will get the job done - Use a suitable size screw remover to drill a hole with cutting size and it’s easy to extract the screw or bolt using extractor tool HARDNESS 63-65HRC : Higher hardness material and is more durable than most screw extractors in market, the hardness and the durability are better than others, Buy with confidence and complete peace of mind *Instructions for use: Select screw remover that is smaller than the damage screw.Use a drill to turn a hole deep enough in the middle of the screw head. Take out the screw remover then reverse the screw extractor Hand drill is turned counter clockwise slowly to drill,but do not use high-speed drilling *Package Includes: 5 X Screw Extractor/box