This tool set includes a set of two locking / adjustment fixtures that interface with the camshafts and are for the critical task of securing and maintaining TDC timing alignment when the cam belt is serviced or removed for other front-engine or cylinder head service tasks.
Please note that this tool is only applicable to the 3.0L V6 AVK series of engines that are installed in Audi A4 and A6 platforms from 2000-2004. It is not applicable to any 5-valve engine.