The wera 16 piece 12 in square drive socket set contains a swivel head ratchet with thumbwheel toggles between forward and reverse and features extra fine teeth for a small backlash angle of only 5 for short strokes during precision work sockets can be used in both manual and power applications extensions fitted with free running sleeve comprises 1 x 12 in square drive zyklop swivel head ratchet1 x 12 in square drive zyklop 250mm extension1 x 12 in square drive zyklop 125mm extension13 x 12 in h