Heat treated alloy steel Sized for all automotive applications Laser engraved for quick identification Available for individual purchase Made in U.S.A.12 piece Master Tamper Proof Torx Set includes 1/4" drive in T10, T15, T20, T25, T27, T30 sizes and 3/8" drive in T40, T45, T50, T55 sizes. Set includes ten (10) hex insert bits and two bit holders.