Reverse spiral design for maximum grip, which helps to ease your work This product contains 10 different size extractors from 3.2 to 10.3 mm, so it can meet your repair work in different circumstances. Recommended drill bit size (for locating hole) engraved on each extractor, suitable for high torque applications This screw extractor set is designed to remove broken studs and s Made of high quality chrome vanadium steel and processed by heat treatment, with high hardness and wear resistanceReverse spiral design for maximum grip, which helps to ease your work This product contains 10 different size extractors from 3.2 to 10.3 mm, so it can meet your repair work in different circumstances. Recommended drill bit size (for locating hole) engraved on each extractor, suitable for high torque applications location) engraved on each extractor, suitable for high torque applications This screw extractor set is designed to remove broken studs and s Made of high quality chrome vanadium steel and