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Cohotek Damaged Stripped Screw Extractor Set for Broken Screw - High-Speed Steel 4241 - Suitable for general sizes and all kinds of broken bits - Universal chuck that suitable for most electric hand drills - Remove broken screw in one step How to Use the Screw Extractor? 1.Choose the suitable size drill bit installed in the socket adapter first, and then attach it to the extension bit holder 2. Use the drill(Dr) bit to drill a hole in broken screws 3. Change to use the extract(Ex) bit with the same size 4. Reverse use the drill and take out the broken bit Warm Tips : - Must drill a hole first when the break screw surface is smooth. Otherwise the drill bit will slip - Must be vertical and low speed (RPM≤200) when drilling, reverse use this bit, drill the first hole deeper will easier to take out - It is best to use electric hand drill, can not be used the hammer drill mode! Must be low speed during use! Package Included: 20* damaged screw extractor 1* Extension Bit Holder 1* Socket Adapter