Length of 10 cm which will probably allow you to use the tips everywhere. 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: 11pcs 100mm long Torx screwdriver bit set Magnetic bits - Thanks to the magnetism, the screws stick 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, improving 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