The WORKPRO 13-piece bit socket set features chrome vanadium steel forged socket and S2 steel forged bits for torque, strength, and durability. All tools within this set meet or exceed all ANSI specifications for added safety. All pieces of this set fit securely within a durable blow-molded carry case for easy organization and convenient portability. <br> Set includes:<br> (7) 1/4" Dr. Bit sockets: T8, T10, T15, T20, T25, T27, T30 <br> (5) 3/8" Dr. Bit Sockets: T40, T45, T47, T50, T55<br> (1) 1/2" Dr. Bit Sockets: T60