: Hex 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. Handle Type: 6.35mm, 1/4 Inch. Mini handle screwdriver size: 120mm in length, suitable for 1/4 inch (6.35mm) hexagonal handle screwdriver head : 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 Advantages: The hexagonal screwdriver head is equipped with an upgraded strong magnet, which can easily grab screws and small parts to avoid falling off. It can improve your work efficiency and will not damage screws and screwdriver heads Advantages: Directly insert the hexagonal screwdriver head into your tool, as long as it is inserted, it will not fall off easily. You can easily use them for vehicle, bicycle, furniture, engineering, machinery, home appliance repairs : Hexagonal drill bit set is suitable for electric screwdrivers, manual screwdrivers, electric drills, air drills and other tools. But please note that it cannot be used for impact drills and electric wrenches