Package contains 5pcs screw extractor + 1pc storage box, the screw removal kit removes damaged screws with speed and precision. 5pcs screw extractor set works with all drills and all sizes of screws and bolts. Sizes: 3-6mm, 6-8mm, 8-11mm, 11-14mm, 14-18mm. Used for maintenance at home, office, etc., to remove all kinds of bolts at broken heads, screws. Practical and efficient. Square end discs, it is compatible with Quick Connect Chuck systems. Made of chrome-vanadium steel, high hardness, high resistance to corrosion. wear and durability.