Features: Durability: the bit is made of high quality S2alloy steel with excellent hardness to reduce wear and ensure service life. Torsion strength: high strength chromium-vanadium steel sleeve provides superior torsion, provides greater torison force, and equipped with polished chrome plating to provide corrosion resistance. Precise position: precisely and automatically machining the tip of the bit to ensure the exact size. The end of the chamfering drill is smoothly inserted. Tool box storage: a set of solid plastic tool box for safe storage and portability. Easy to use: each bit has its size imprinted on the bit itself, making it easy to identify them after you've removed a handful from the case. Specifications: Item Material: Chromium-vanadium Steel + S2Alloy Steel Item Color: Silver Box Color: Blue Size: as picture show Package Weight: approx.2868g Type: Star E female socket Star bit socket Star tamper bit socket Star plus bit socket CrV socket Package List: 14Pcs E Socket: 5pc - 1/4" Dr.: E4, E5, E6, E7, E8 5pc - 3/8" Dr.: E10, E11, E12, E14, E16 4pc - 1/2" Dr.: E18, E20, E22, E24 17Pcs Star Bit Socket: 10pc - 1/4" Dr.: T6, T7, T8, T9, T10, T15, T20, T25, T27, T30 5pc - 3/8" Dr.: T40, T45, T47, T50, T55 2pc - 1/2" Dr.: T60, T70 Star 17Pcs Tamper Bit Socket: 10pc - 1/4" Dr.: T6H, T7H, T8H, T9H, T10H, T15H, T20H, T25H, T27H, T30H 5pc - 3/8" Dr.: T40H, T45H, T47H, T50H, T55H 2pc - 1/2" Dr.: T60H, T70H 12Pcs Star Plus Bit socket: 7pc - 1/4" Dr.: T8, T10, T15, T20, T25, T27, T30 4pc - 3/8" Dr.: T40, T45, T47, T50, T55 1pc - 1/2" Dr.: T60