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_x000D_ Material: Chrome-Vanadium Steel_x000D_ Toolbox Color: Blue_x000D_ Toolbox Size: Approx. 220 x 113mm/8.7 x 4.4in_x000D_ Square Wrench Drive Size: 3/8in_x000D_ Hex Bits Specifications: T25, T30, T40, T45, T50, T55, T60_x000D_ Bits Total Length: Approx. 110mm/4.3in_x000D_ Quantity: 7pcs/set_x000D_ Suitable for: 3/8in square wrench drive/air impact wrench/power rod, etc._x000D_ 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.