Universal Valve Lash Adjusting ToolThis tool is like having 16 valve lash adjusting tools in one. It configures to adjust all shaft & stud mount rocker systems on the market today. Now you don't have to buy a new valve lash adjusting wrench for each different rocker system. Just snap on the appropriate std 1/2" drive socket,insert the correct hex key and you are good to go. It is designed with the correct length to easily tighten down any adjuster nut and makes breaking loose stubborn adjusters easy.