Function: 1 The screws are easy to suck in during installation. Bits are common tools for electric screwdriver, manual screwdriver, electric drill 2. Driver bits are easy to install, high precision 3. Chrome vanadium steel material has high strength and hardness, very durable 4. The square rotating rod and hex handle have high work efficiency and save time and effort 5. This set includes 7 specifications, a variety of sizes to meet your different needs. Also comes with a cover for convenient storage. Specifications: