Description: High Quality Screw Extractor: Our screw extractor kit is made of durable high hardened steel- HSS 4341. Designed for easily removing screws and bolts. Includes 5 or 6 common sizes extractors works with any drill and any size screw or bolt. Wide Compatibility: Can be widely used in household, telecommunication, automotive or machinery repair work. Suitable for general sizes and all kinds of broken bits. Universal chuck that suitable for most electric hand drills. Tips for Use: It is best to use electric hand drill. Must drill a hole first when the break screw surface is smooth. Otherwise the drill bit will slip. Must be vertical and low speed when drilling, reverse use this bit, drill the first hole deeper will easier to take out. Easy to Use: Use the drill bit to drill a hole in broken screws. Change to use the extract bit with the same size. Reverse use the drill and take out the broken bit. Modern Tool: Keep this set in your toolbox to get the damaged screw out and your project back on track. Highly suitable for various machinery repair work. Specification: Material: HSS Bit length: approx. 51mm/ 2 inch Recommended Screw Extractor for screws and bolts with diameter measuring: #0 smaller than 3/32 inch (smaller than 3mm) #1 3/32 to 3/16 inch (3mm-5mm) #2 5/32 to 5/16 inch (4mm-8mm) #3 3/16 to 13/32 inch (5mm-10mm) #4 1/4 to 15/32 inch (6mm-12mm) Package Includes: 5 or 6 Pieces Screw Extractor Bits Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.