The OEMTOOLS 13-pc Tamper Proof Star Bit Socket Set, No. 22710, comes in many star bit sizes, including the (1/4” drive) T8, T10, T15, T20, T25, T27, T30, (3/8” drive) T40, T45, T47, T50, T55, and (1/2” drive) T60. The hard wearing bits are made of heat-treated alloy steel while the reinforced chrome vanadium steel sockets are designed to give users extra turning power. The bits have been treated with zinc oxide to prevent rust and corrosion. The socket set exceeds ANSI standards and comes in a sturdy blow molded case for convenient and organized storage.