Length of 10cm, so you can probably use the tips 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 - Set of 11 Torx Screwdriver Bits 100mm Long Magnetic Bits - Thanks to magnetism, the screws stick to the bits and can be easily removed even from the deepest holes without turning or shaking the object where they are located, improving your work efficiency Shank Type: 6.35mm/1/4 inch, Hex. These magnetic bits attract screws. They can be used with manual screwdrivers, electric screwdrivers or electric drills .