The Mikuni HSR Easy Tool Kit includes all the important tools to perform basic jetting and maintenance on Mikuni's HSR 42, HSR 45 and HSR 48 carburetors. The kit includes a 17mm x 11/16" wrench to loosen and tighten the choke nut and drain plug, a Hex Wrench for adjusting the throttle setting and a main jet T-wrench handle with a slip-in Phillips and flat head combination screwdriver blade and a slip-in hex wrench for easy needle adjustment.