Feature:1. Screws can be easily sucked during installation, bits are general tools for electric screwdrivers, manual screwdrivers and electric drills2. Screwdriver bit is easy to install, come with high accuracy3. Chrome vanadium steel material, possess high strength and hardness, very durable4. Square rotating rod and hex handle, possess high work efficiency, saving time and effort5. This set contains 7 specifications, different sizes can meet different needs, and also comes with a cover for convenient storageSpec:Item Type: Screwdriver BitMaterial: Chrome vanadium steelBit Length: Approx. 150mm / 5.9inSpinner Head Type: SquareSpecifications: SQ1, SQ2, SQ2.5, SQ2.74, SQ3, SQ4, SQ5Hex Handle Size: 1/4inPackage List:7 x Screwdriver Bit1 x Screwdriver Bit Cover