The knipex 981330 vde insulated hexagon screwdriver is for 30mm hexagon socket screws it has an insulated chrome vanadium molybdenum steel blade with a length of 75mm and a 107mm ergonomically optimised dual component handle for reduced fatigue and optimum transmission of force the handle design gives a greater torque action and will prevent rolling of worktops benches etc this screwdriver like all vde screwdrivers in the knipex range is vde tested for safety and user protection according to din