Wera series 160 i7 insulated screwdriver sets are tested individually for dielectric strength under a load of 10000 volts so as to ensure safe working with loads up to 1000 volts they have a lasertip a tip which has a laser roughened surface which literally bites into the screwhead reducing cam out and eliminating the need for two handed screwdriving they have a significantly extended service life due to bit grade steel used in all wera screwdrivers and have the patented kraftform handle which i