The Wera Slotted 160i VDE insulated screwdrivers are tested individually for dielectric strength under a load of 10,000 volts so as to ensure safe working with loads up to 1,000 volts. They have a premium lasertip which is a laser roughened surface that literally bites into the screwhead, reducing cam out. With patented ergonomic, multi component Kraftform handle which uniquely fits to the shape of the hand during screwdriver use. Please note: WER006100 does not have a Lasertip.Blade Length, 100mmTip, 4.0mm