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 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 Pro-grade set in hard-to-find Torx bit and E-sockets Seven 1/4-Inch drive sockets in sizes: T-8, T-10, T-15, T-20, T-25, T-27, T-30 (37mm length) Five 3/8-Inch drive sockets: T-40, T-45, T-47, T-55 (48mm length); 1/2-Inch drive T-60 Heat-hardened Chrome-vanadium steel, mirror-chrome finish Complete in custom-fit ABS storage and carry case