11-Piece Torx Screwdriver Bit Set for Torx Star Screws, Hex Shank 6.35mm T6-T40 Drill Bit Tools (100mm Length) Purchased for special screws and used only once. 【Sizes】11-piece set of 100mm Torx screwdriver bits: T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40. 【Magnetic】Magnetic bits can be fixed on the screwdriver, and can attract screws for easy use. 【Material】The bits are made of high-hardness S2 alloy steel. Shank diameter: 6.35mm hex shank. The surface is smooth and wear-resistant. Convenient and highly efficient. 【Widely Applicable】Suitable for electric screwdrivers, hand screwdrivers, electric drills, air drills, etc.