Urrea combination wrench, 1218b, 9/16″ opening, 12 point, black oxide finish black combination wrenches feature two same-size openings on the same wrench; a fixed-size open-end for the purpose of applying quick, low torque (to tighten) and a box-end allowing you to apply final torque with greater torsion (to tighten). Its super drive geometry allows the box-end to couple onto the nut or bolt hexagon using the fastening element’s faces as opposed to the edges, which are the potential failure points. Now with: ugs (urea grip sistem)