Premium Wera insert wrench screwdriver with hollow shaft for screwdriving on thread rods, because only then can the thread rod penetrate through the bolt into the hollow shaft of the screwdriver. Multi-component Kraftform handle for high working speeds and particularly ergonomic screwdriving. Kraftform Plus: Hard handle zones for high working speeds, while soft handle zones guarantee a high torque transfer. With hexagon anti-roll protection against rolling away. Handles marked for easy identification and sorting of tools. For external hexagon screws.