STOMSKI RACING's version of this tool works on both the intake and the exhaust cams on the Cup engines and on all non-vario cams for the other GT3-type engines. This tool replaces the factory tool P9653/1. Moreover, additional refinements of this tool ensures that while torquing either the 16mm hex or the triple-box cam sprocket bolts, your tool is securely bushed and supported in the center of the tool, and thus will not slip off or round off the bolts. Black oxide finished hardened steel.