The 13-piece Torx socket set features a forged chrome vanadium steel socket and S2 forged steel forges for torque, strength and durability. Dr. 1/4 Bit Sockets - Chrome vanadium sockets provide maximum oil and corrosion resistance. Forged S2 steel bit, heat treated, provides torque, strength and durability, Size: T8, T10, T15, T20, T25, T27, T30.< /p> 3/8 Dr. Bit Sockets - Chrome vanadium plated sockets provide maximum oil and corrosion resistance Forged S2 steel bit, heat treated , ensuring torque, strength and durability Size: T40, T45, T50, T55 T60 1/2 Dr. Bit Sockets - Chrome vanadium chrome sockets provide maximum resistance to oil and corrosion corrosion Forged S2 steel drill bit, heat treated, ensuring torque, strength and durability, Size: T70.< /p> Package Includes - All parts in this set store neatly in a durable carry case molded by blow molding for easy organization and convenient portability.