Strong, hardened GCr15 bearing steel screw extractors with tapered design for multiple fixing sizes. For use with all types of power drill in reverse mode. Reverse-threaded shafts enable combined bite and removal of broken screws and bolts in one action. Requires pilot hole of around 50% screw/bolt diameter. Includes sizes 1/8″ – 1/4″/M3 – M6, 1/4″ – 5/16″/M6 – M8, 5/16″ – 7/16″/M8 – M11, 7/16″ – 9/16″/M11 – M14, 9/16″ – 3/4″/M14 – M18, 3/4” – 1”/M18 – M24.