The 13-piece Torx socket set includes a forged socket made from chrome vanadium steel and forged bits made from S2 steel for torque, strength and durability. 1/4" Dr. Bit Sockets - Chrome vanadium chrome plated sockets provide maximum resistance to oil and corrosion. Bit made from forged, heat-treated S2 steel for torque, strength and durability, Size: T8, T10, T15, T20, T25, T27, T30. 3/8" Dr. Bit Sockets - Chrome vanadium chrome plated sockets provide maximum resistance to oil and corrosion. Bit made from forged, heat-treated S2 steel for torque, strength and durability, Size: T40, T45, T50, T55 T60. 1/2" Dr. Bit Sockets - Chrome vanadium chrome plated sockets provide maximum resistance to oil and corrosion. Maximum oil and corrosion resistance. Forged, heat-treated S2 steel drill bit for torque, strength, and durability. Size: T70. Package Includes - All pieces in this set fit neatly into a durable blow-molded carrying case for easy organization and convenient portability.