The 10cm length will probably allow you to use the bits anywhere. Available sizes: T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, and T40 to meet your different needs. Material: S2 alloy steel - Head type: Torx - 11-piece 100mm long Torx screwdriver bit set. Magnetic bits - Thanks to magnetism, screws adhere to the bits and can be removed, even from the deepest holes, without difficulty and without the need to turn or shake the object where they are located, which improves your work efficiency. Shank Type: 6.35mm/1/4", Hex. These magnetic bits attract screws. They can be used with manual screwdrivers, electric screwdrivers or electric drills Due to manual measurement, please allow slight errors in size. Your support is our greatest driving force and we will serve you wholeheartedly! I wish you a happy shopping!