Set comprises Model No's. VS777, VS777E & VS780 to provide timing belt pulley locking, to retain timing positions, on single & twin cam petrol & diesel engines. These locking tools act as a second pair of hands to hold camshafts in position during timing belt replacement. Huge range of applications from closely positioned sprockets on many twin cams to more widely spaced cam/injector pump sprockets on certain diesel engines. Model No. VS777 incorporates adjustment to cover different sprocket diameters & tooth pitches.