The redesigned STM 4G63 cam alignment tool features an open center with pointers to help locate the timing marks on your DSM cam gears. While its a subtle change to the old tool, it certainly helps ensure things are timed correctly the first time around. This tool works with all 4G63 1G/2G DSM, GVR4 and Evolution 1-9 models. Please note that the pointers are only for DSM's. Evo Cam gear marks point up and align with the valve cover.