The RCS23M combination ratchet wrench and socket set is one of the most versatile tool kits available from the Kennedy Professional range. The set is made up of ten combination spanners (10 to 19mm inclusive) the open ended jaw can be used in the normal way BUT unlike traditional combination spanners that have a fixed Bi-hex ring the spanners in the RCS23M set have a 72 tooth Bi-hex ratchet mechanism that can either be used to directly drive the fastener OR when fitted with quick release square adaptor can be used with traditional sockets OR and we've saved the best till last! Using a Go-Thru? single hex socket from the set, you can drive nuts along threaded rods as the section of rod the nut has just travelled across projects through the back of the socket! The combination spanners, Go-Thru? sockets and adaptors are all manufactured to ASME industrial production standards from chrome vanadium steel with a corrosion resistant fully chrome plated mirror finish. The RCS23M set is supplied complete in a heavy duty fitted metal storage case fitted with locking lid and carry handle. Conforms to ASME B107.6 Contents 10 to 19mm inclusive Go-Thru? Single Hex Sockets (1mm increments) 10 to 19mm inclusive Ratchet Combination Wrenches (1mm increments) Quick Release Square Drive Adaptors 1/4'' SD (x 10mm hex), 3/8'' SD (x 13mm hex), 1/2'' SD (x 19mm hex).