Holds valve timing on twin or quad cam engines during timing belt replacement. Patented 'Uni-fit' tooth design suits varying cam gear sizes. Compact size allows operation in confined engine compartments. Prevents engine damage caused by mis-timing. Reduces repair time Patented friction locking system allows infinite locking positions to suit most cam gear configurations. Less moving parts for easy operation. Large scalloped locking knobs provides positive grip for firm clamping. Constructed from industrial grade fibre reinforced synthetic polymer. Lightweight and corrosive resistant. Allows belt replacement to be carried out by one person. Suits timing gear diameters from approximately 4" to 6". Suits gearing spacings from approximately 1/16" to 3".