The 13-piece Torx socket set features a forged chrome-vanadium steel socket and S2 forged steel forges for torque, strength, and durability. Dr. Bit sockets 1/4" - Chrome vanadium sockets provide maximum resistance to oil and corrosion bit Forged S2 steel bit, heat treated, provides torque, strength and durability, Size: T8, T10, T15, T20, T25, T27, T30. 3/8" Dr. Bit Sockets - Chrome vanadium plated sockets provide maximum resistance to oil and corrosion bit 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.Forged S2 steel drill bit, heat treated, ensuring torque, strength and durability, Size: T70. Package Includes - All parts in this together pack neatly into a durable blow-molded carrying case for easy organization and convenient portability.