Features Included parts: including screw extractors, hex shank twist drill, screwdriver bits and 1/4 extension rod, different sizes meet more requirements. SCREW EXTRACTOR: With this screw extractor set, you can easily remove all common screws and are specially designed for damaged or flaked screws. Rotary drill: including 5 pieces twist drill bits in different sizes, standard hex shank design, which can be easily installed on electric or hand tools. Metal material: these parts are made of Cr-vanadium steel with high hardness, wear resistance, impact resistance and long service life. Storage box: This kit is equipped with a plastic storage box to ensure stable fixation and good protection for these parts and prevent loss. Specification: Item Type:Screw Extractor Set Screw Extractor Thread Diameter: 5-7 mm / 0.2-0.3 inches. 6-8 mm / 0.24-0.31 inches. 8-11 mm / 0.31-0.43 inches. 11-14 mm / 0.43-0.55 inches. 14-18 mm / 0.55-0.71 inches. Hex Shank Twist Drill Diameter: 2.5 mm / 0.1 inches. 3.5 mm / 0.14 inches. 4 mm / 0.16 inches. 5 mm / 0.2 inches. 8 mm / 0.31 inches. 8pcs screwdriver bits: CR-V 4, CR-V 6, CR-V PH1, CR-V PH2, CR-V PZ2, CR-V H4, CR-V H5, CR-V H6 1/4 interface self-locking screwdriver bit extension bar Package list: 5 x screwdrivers. 5 x twist drill bits with hex shank. 8 x screwdriver bits. 1 x bit extension rod. 1 x storage box Package List 5 x Screw Extractors 5 x Hex Shank Twist Drills 8 x Screwdriver Bits 1 x Bit Extension Rod 1 x Storage Box