Shaft type: 6.35mm / 1/4-inch hex Size: 100mm; Size: T8, T10, T15, T20, T25, T27, T30, T40 Materials: S2 alloy steel; Head type: Torx; can be magnetic bits firmly fixed on screwdriver; 8 sizes meet a set of your needs. Installation can easily suck screws of electric screwdriver, manual screwdriver, electric drills, general group tools. Product Description These extra-long screw bits are heads that fit all models of screwdrivers, as well as drills-screwdrivers, screwdrivers, etc.... All sizes are there, these elongated bits go everywhere. They fit very well on a drill and they are magnetized, which is very practical so as not to lose the screws. Features: Strong magnetic, good workmanship, high precision. In installation can easily suck screws, electric screwdriver, manual screwdriver, electric drill, general tool group. Specification: Torx head type Total length 100mm Shank type 6.25mm / 1/4 inch hex Size T8, T10, T15, T20, T25, T27, T30, T40 Les Package includes: 8 x Torx screwdrivers