(13) SAE Hex Bit Sockets: 5/64″ 1/4″ Drive (ATD-189) 3/32″ 1/4″ Drive (ATD-190) 1/8″ 1/4″ Drive (ATD-191) 5/32″ 1/4″ Drive (ATD-192) 3/16″ 1/4″ Drive (ATD-194) 7/32″ 1/4″ Drive (ATD-195) 1/4″ 1/4″ Drive (ATD-196) 9/32″ 3/8″ Drive (ATD-197) 5/16″ 3/8″ Drive (ATD-187) 3/8″ 3/8″ Drive (ATD-188) 7/16″ 3/8″ Drive (ATD-198) 1/2″ 3/8″ Drive (ATD-199) 9/16″ 1/2″ Drive (ATD-201) Bits are made from S2 steel to meet or exceed torque specifications Sockets are made from heat treated chrome vanadium steel for strength & durability