Chrome Vanadium, Mirror Polished Sockets with S2 Steel Bits 1/4" Drive: T8H, T10H, T15H, T20H, T25H, T27H, T30H (37mm Length) 3/8" Drive: T40H, T45H, T47H, T50H, T55H (48mm Length) 1/2" Drive: T60H DURABILITY: bits made of premium S2 alloy steel for superior hardness that reduce wear-outs and insure longevity TORQUE STRENGTH: high strength chrome vanadium steel sockets provide superior torque for greater turning power with mirror chrome finish for corrosion resistance PRECISION BITS: precisely and automatically machined bit tips to ensure accurate size, chamfered bit ends insert smoothly into fasteners and protect both bits and fasteners from damaged edges ORGANIZED STORAGE: set includes a sturdy plastic organizing case for secure storage and easy carrying 13-Piece Security type tamper proof torx star bit socket set includes: 1/4” Drive: T8, T10, T15, T20, T25, T27, T30; 3/8” Drive: T40, T45, T47, T50, T55; 1/2” Drive: T60