describe Made of S2 Alloy Steel - Tough and Wear Resistant - 11 x 100mm long 1/4" Torx bits are made of high quality S2 steel, 6.35mm hex, impact resistant and tough, highly wear resistant. [T6-T40 hexagonal blade 100mm long] 10cm long, the inner hollow design is more economical. These are T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40 sizes to meet your different needs, compatible with electric screwdrivers, manual screwdrivers, air drills, impact drivers, etc. Magnetic Screwdriver Bit: Due to magnetization, the screw will also stick to the screw head, in deeper holes, the screw can be removed without turning or shaking the object, which improves your work efficiency. [Handle Type] 6.35mm/1/4" inner hexagon, magnetic long drill bit for easy installation of suction screw, electric screwdriver, manual screwdriver, electric drill, universal tool set. There is a handle on the upper part with non-slip hexagon, which is easier to use. Wide ApplicationsThis screwdriver bit set is used for electric screwdrivers, manual screwdrivers, air drills and more. Suitable for professional maintenance personnel, computer repair, camera repair, manual electric screwdriver. 11 Pack 1/4" T6-T40 Magnetic Star Head Long Torx Screwdriver Bit Set 100mm Long Hex Shank Electric Torx Bits Features: Made of high-quality 6.35mm S2 steel, durable, impact-resistant and strong, widely used in hardware. The entire screwdriver body is magnetic, which can firmly fix the bit on the screwdriver and fix the screws, improving your work efficiency. These 100mm screwdrivers are suitable for electric screwdrivers, manual screwdrivers, power drills, pneumatic drills, cordless drills, impact drivers and more. 10 cm long, you can go anywhere. Exquisite workmanship, each edge can be tightened precisely without damaging the screws and screwdriver bits.