Wera 05003641001 8784 c2 zyklop adaptor 1 2in drive wera 05003641001 this zyklop adaptor from wera is made from chrome vanadium and has a quick release chuck for fast bit changes it has a 1 2in square drive and is suitable for use with 5 16in hex bits wera 05003641001 8784 c2 zyklop adaptor 1 2in drive