Includes 6-lobe ribe/polydrive bit sockets Bits are made from S2 steel to meet or exceed torque specifications Sockets are made from heat treated chrome vanadium steel for strength & durability Custom blow molded case included. ATD carries a complete line of bit sockets available individually. These high quality ribe bit sockets are designed to be used with hand tools only. The bit socket warranty is voided if they are used with any type of impact tools. Set Includes: (13) Ribe Bit Sockets: M4 1/4" Drive - ATD-255 M5 1/4" Drive - ATD-256 M6 1/4" Drive - ATD-257 M7 3/8" Drive - ATD-258 M8 3/8" Drive - ATD-259 M9 3/8" Drive - ATD-261 M10 3/8" Drive - ATD-262 M11 3/8" Drive - ATD-263 M12 3/8" Drive - ATD-264 M13 1/2" Drive - ATD-265 M14 1/2" Drive - ATD-266 M15 1/2" Drive - ATD-267 M16 1/2" Drive - ATD-268