Wera kraftform kompakt vde components undergo dielectric strength test under a 10000 volt load in a water bath to reassure users that their screwdrivers have been exhaustively tested for their most important feature their insulation each individual wera vde screwdriver and component is subjected to this test to guarantee safe working up to 1000 volts both handles in this set feature kraftform plus ergonomics with hard gripping zones for high working speeds and soft zones ensure comfort during