Not only can you use the bits on your hand tools, but you can easily insert them into any 1/4" hex shank power drill. Industrial Quality: Magnetic Hex Bits are made of high-quality heat-treated solid S2 steel, enough for industrial use. They have enough toughness and twisting force to keep the tips from breaking and fraying. Magnetic Suction Head: With magnetism, it can firmly adsorb the screws, preventing the screws from falling and losing. The magnetic tip enhances the connection to the screw to ensure a secure grip, it minimizes screw wear and improves work efficiency. High Precision: Every edge of this hex bit set can precisely lock the screw without damaging the screw or screwdriver bit. Multiple specifications to meet your needs for screwing various sizes of hexagon socket screws! Wide Range Of Use: Suitable for electric screwdrivers, manual screwdrivers, electric drills, and drills. Ideal for working on motorcycles, bicycles, and furniture for easy furniture and equipment repair and disassembly. Length: 50mm, 75mm, 100mm, 150mm The handle length is 28mm The distance between the sides of the handle diameter is 6.35mm, that is, the 1/4" specification 50mm set tool bar edge alignment distances: H1.5/1.5mm, 2mm, 5/2.5mm, 3mm, H4/4mm, H 5/5mm, H6/6mm, H8/8mm 75mm set tool bar edge alignment distances: 2mm, 5/2.5mm, 3mm, H4/4mm, H 5/5mm, H6/6mm, H8/8mm The edge distance of the 100mm set tool holder: 5/2.5mm, 3mm, H4/4mm, H 5/5mm, H6/6mm, H8/8mm 150mm set tool bar edge alignment distances: 3mm, H4/4mm, H 5/5mm, H6/6mm, H8/8mm