The Wera 837 i RA Kraftform Blade-Holding VDE Ratcheting Handle is an impressively versatile hand tool that has been tested up to 10,000V The integrated ratchet with fine toothing 40 teeth and a return angle of 9 eases and accelerates screwdriving without having to reposition the tool. The individual testing at 10,000 volts, in accordance with IEC 60900, ensures safe working with loads up to 1,000 volts. The basic idea for the prototype of the Kraftform handle - that the hand should dictate the design - has, right through to today, proved to be correct. In cooperation with the internationally recognised Fraunhofer IAO Institute, Wera developed a screwdriver handle designed to match the shape of the human hand as long ago as the 1960s. After a long development phase, the Wera Kraftform handle was launched to the market in 1968. It has been optimised through the years with new technologies, but has kept its proven shape. After all, the human hand has not changed either.