Product description: Quantity: one set (5 pieces) Product packaging: plastic box Sizes: 3- 6mm, 6-8mm, 8-11mm, 11-14mm, 14-18mm Package included 5pcs screw extractor + 1pc storage box, screw removal kit screw removes damaged screws with speed and precision. The 5-piece 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 home, office maintenance, etc., to remove all kinds of broken head bolts , screw. Practical and efficient. Square end discs, it is compatible with Quick Connect Chuck systems. Note: The five-piece set can only hold screws and two-way pipes, but not faucets and triangular valves. It is suitable for screws with a diameter of 4 to 18 mm.