: Hexagonal drill bits come in 10 different sizes: 12mm, 10mm, 8mm, 6mm, 4mm, 5mm, 3mm, 2.5mm, 2mm, 1.5mm, to meet your various needs. Length: 100mm. Shank Type: 6.35mm, 1/4 Inch. : This hexagonal drill bit is made of high-quality material S2 steel, with stable performance, high strength, good wear resistance, and hardness up to HRC60. The outer layer is wrapped with a green wear-resistant rubber heat shrink tube, which is rust-proof and waterproof. : The hexagonal screwdriver head is equipped with an upgraded strong magnet, which can easily grab screws and small parts and avoid falling off. It can improve your work efficiency and will not damage the screws and screwdriver heads. : Directly insert the hexagonal wrench bit into your tool, as long as it is inserted, it will not fall off easily. You can easily use them for vehicles, bicycles, furniture, engineering, machinery, home appliance repairs, etc. : The hexagonal wrench bit set is suitable for tools such as electric screwdrivers, manual screwdrivers, electric drills, air drills, etc. But please note that it cannot be used for impact drills and electric wrenches.