1、10 PCS SET: The set contains 5 pcs broken screw extractors and 5 pcs twist drill bits in different specifications for your use to meet various needs. 2、HIGH SPEED STEEL DRILL BIT: The drill bits are made from high speed steel with anti rust titanium coating, have better corrosion resistance, high temperature heated, ensure high hardness. 3、BEARING STEEL SCREW EXTRACTOR: The screw and bolts removers are forged by bearing steel, overall quenched, with high hardness and strong toughness. The surface thread is clear and not easy to slip. 4、EASY TO USE: Use twist drill bit to drill the bottom hole, and then use the extractor to reverse screw out the broken screw. 5、MULTI USAGE: The screw extractor and drill bit set can be used for crews, bolts and studs for home maintenance, car garages, etc. 5 x Twist Drill Bit5 x Screw Extractor1 x Storage Box Item Type: Screw Extractor Drill Bit SetMaterial: High Speed SteelTwist Drill Bit Specification: 5/16in, 1/4in, 3/16in, 1/8in, 3/32inDamaged Screw Extractor Size: #1, #2, #3, #4, #5Application: Approx. 14-18mm / 0.55- 0.71in, 11-14mm / 0.43- 0.55in, 8-11mm / 0.31- 0.43in, 6-8mm / 0.24- 0.31in, 5-7mm / 0.2- 0.28inUse: Screws, bolts and studs for home maintenance, car garages, etc.