1、9Pcs in 1 Set: The kit includes 9pcs socket bits, with different size specifications, suitable for different scenarios. 2、Chrome Vanadium Steel: Made of chrome vanadium steel material, with high hardness and wear resistance, and not easy to deform. 3、1/4in Hex Shank: These socket bits have standard 1/4in hex shank, suitable for most standard rotating tools. 4、Multiple Usages: Can be installed in hex rotating tools such as electric screwdrivers, electric drills, and manual screwdrivers. 5、With Storage Holder: Equipped with a storage holder, which can fix these hex socket bits well for easy access and storage. 9 x Socket Bit1 x Storage Holder  Item Type: Socket BitMaterial: Chrome vanadium steel + rubberPurpose: Can be installed in hex tools such as electric screwdriver, electric drill, manual screwdriver, etc.Shank Type: Hex shankShank Size: 1/4inSocket Specifications: Approx.5mm / 0.2in6mm / 0.24in7mm / 0.28in8mm / 0.31in9mm / 0.35in10mm / 0.39in11mm / 0.43in12mm / 0.47in13mm / 0.51in