Their 10 cm length allows you to use the bits anytime and 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 - 11pcs 100mm long screwdriver bits set. Magnetic Bits: Thanks to magnetism, screws are easily attached and removed even in the deepest holes, without rotating or shaking the object being screwed, thus improving your work efficiency. Shank Type: 6.35 mm/1/4 in Hex. These magnetic bits hold screws in place. They can be used with manual screwdrivers, electric screwdrivers or electric drills.