Features: 1.High?quality chrome vanadium steel materials, increased torsion and offers unparalleled hardness. 2.The hardened chrome vanadium steel socket improves the rotation power and reduces wear. 3.With complete resistance to rust and corrosion, which is not easy to be damaged, long lifespan. 4.The end of the drill bit is designed with precise chamfering, which can be inserted smoothly and conveniently. 5.The size is printed on the socket for easy and fast identification, bring much convenience for you. Specification: Item Type: Wrench Socket Bit Material: Chrome-Vanadium Steel Toolbox Color: Blue Toolbox Size: Approx. 220 x 113mm/8.7 x 4.4in Square Wrench Drive Size: 3/8in Hex Bits Specifications: T25, T30, T40, T45, T50, T55, T60 Bits Total Length: Approx. 110mm/4.3in Quantity: 7pcs/set Suitable for: 3/8in square wrench drive/air impact wrench/power rod, etc. Application: Household, automobile, etc. PackageList: 7 x Bits 1 x Tool Box Note: Please allow 1?2mm error due to manual measurement. Thanks for your understanding.