Wera 05104904001 190 i VDE Kraftform Plus Insulated Nutdriver are VDE nutdrivers that are designed with a multi-component Kraftform Plus handle for fast and low fatigue working featuring hard gripping zones for high working speeds whereas soft zones ensure a high torque transfer. Wera 190 i VDE Kraftform Plus Insulated Nutdriver are individually tested in water baths at 10,000 volts for secure work at the permissible voltage of 1,000 volts and are designed with a hexagonal anti-roll feature which prevents any bothersome rolling away at the workplace.