Hex drill bits come in 10 different sizes: 12mm, 10mm, 8mm, 6mm, 4mm, 5mm, 3mm, 2.5mm, 2mm, 1.5mm, to meet 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 S2 steel, offering stable performance, high strength, good wear resistance, and hardness up to HRC60. The outer layer features a green wear-resistant rubber heat shrink tube, providing rust-proof and waterproof protection. The hexagonal screwdriver head includes an upgraded strong magnet, allowing easy pickup of screws and small parts, reducing the risk of dropping. This helps improve work efficiency and prevents damage to screws and screwdriver heads. The hexagonal screwdriver head fits securely into compatible tools and stays in place during use. Suitable for use with electric screwdrivers, manual screwdrivers, electric drills, air drills, and other compatible tools. Note: Not suitable for impact drills or electric wrenches.