The CTA Tools Benz Camshaft Timing Tool Kit - M177 and M178, No. 3768, is designed to assist technicians in aligning and holding the camshaft to top dead center (TDC) accurately, making it ideal for performing maintenance or repair work on 2014+ Mercedes-Benz AMG C63, E63, S63, GT, and GT-S with bi-turbo 4.0L V8 engines M177 and M178. The tool is made of high-quality materials such as carbon steel for durability. It comes with an EVA insert blow molded case for organized storage.