Works on most spline, hex, and two flat design tie rods Spring-loads upper jaw pivots to accommodate tie rods ranging in size from 10mm-18mmWrench is self-adjusting Cam action increases the gripping pressure as the load applied to the handle increases Heat-treated for durability. This tool is used for adjusting tie rods on vehicles with rack and pinion steering. Fits various sizes ranging from 10mm to 18mm. This Tie Rod Wrench is made with the durability and strength to get the job done!