Wera 05003639001 8794 c zyklop wobble extension 1 2in drive wera 05003639001 this zyklop wobble extension from wera is made from brushed chrome plated chrome vanadium and swivels through 15 this extension has a 1 2in square drive socket with a ball lock wera 05003639001 8794 c zyklop wobble extension 1 2in drive