Features 9Pcs in 1 Set: The kit includes 9pcs socket bits, with different size specifications, suitable for different scenarios. Chrome Vanadium Steel: Made of chrome vanadium steel material, with high hardness and wear resistance, and not easy to deform. 1/4in Hex Shank: These socket bits have standard 1/4in hex shank, suitable for most standard rotating tools. Multiple Usages: Can be installed in hex rotating tools such as electric screwdrivers, electric drills, and manual screwdrivers. With Storage Holder: Equipped with a storage holder, which can fix these hex socket bits well for easy access and storage. Specification: Item Type: Socket Bit Material: Chrome vanadium steel + rubber Purpose: Can be installed in hex tools such as electric screwdriver, electric drill, manual screwdriver, etc. Shank Type: Hex shank Shank Size: 1/4in Socket Specifications: Approx. 5mm / 0.2in 6mm / 0.24in 7mm / 0.28in 8mm / 0.31in 9mm / 0.35in 10mm / 0.39in 11mm / 0.43in 12mm / 0.47in 13mm / 0.51in Package List: 9 x Socket Bit 1 x Storage Holder  Package List 9 x Socket Bit 1 x Storage Holder