GEROTEC - (Automotive tools) heavy duty GEARED LUG WRENCHES. GEROTEC heavy duty wheel nut wrenches facilitate the effortless removal of stuck wheel nuts on trucks, agricultural tractors, horses, trailers, busses, moveable cranes etc. in situations where tyre removal is required, like roadside tyre changes. This is achieved by means of a geared lug wrench which multiplies applied forces (torque multiplier)