8790 B VDE Zyklop 3/8" socket, insulated8790 B VDE Zyklop 3 8" socket, insulated Wera 8790 B Zyklop VDE 3 8" Drive Socket. This Zyklop VDE socket offers increased safety thanks to a 2 component isolation. The yellow insulation core becomes visible in case of any damage to the outer red VDE insulation layer, to ensure safe working. A ball stop groove allows for a secure fit when used with the Zyklop VDE ratchet. Each socket is individually tested and fully rated to 1,000 volts in accordance