This tool, for use on VWs and Audis, has been designed to allow for the easy adjustment of the camshaft spur belts having idler pulleys with pin holes. In operation, this spanner wrench with its protruding pins, grips the center of the idler pulley and rotates it around its off-center retaining bolt. This rotation then allows for camshaft spur belt tension adjustment. Made from heat treated alloy steel, this unique tool comes with a black finish and a soft grip handle.