Mr. Gasket Degree Wheels deliver maximum accuracy for the cam installation of any engine. Camshaft centerline, valve timing, top dead center, bottom dead center – every timing function of an engine can be quickly determined with this easy-to-read 7-inch blue degree wheel. It's marked in one-degree increments and comes with easy-to-follow instructions etched right into the face of the wheel and two adapters for a universal fit.