SKIL 013-449-SKL Speed Slide Wrench Patented spring-loaded ratcheting cams - located in the jaws that allow the tool to ratchet while its locked on to a bolt Self-adjusting jaws can grip various bolt head shapes and sizes Chrome Vanadium steel for lifelong durability and corrosion resistance Adjusts to 9 common standard and metric sizes, & in between Slim-lined design allows access into hard to reach spots