10 cm length which will probably allow you to use the bits 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: Set of 11 screwdriver bits, 100 mm long. Magnetic bits - Thanks to magnetism, 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 located, improving your work efficiency. Shank Type: 6.35mm/1/4", Hex. These magnetic bits attract screws. They can be used with hand screwdrivers, electric screwdrivers or electric drills