Wera hmc zyklop 12in ratchet sockets wera 05003608001 this 17mm socket from wera can be used with a zyklop ratchet with 12in square drive to tighten or loosen hexagon headed screws nuts and bolts made from chrome vanadium with a brushed chrome plated finish this socket is suitable for use with both hand and non impact power tools there is a knurled base for precision handling in manual operations wera 05003608001 hmc zyklop ratchet 12in socket 17mm