For overhead camshaft engines using spacer shims. Also works on double overhead cams. This tool has been designed to allow for easy valve adjustment on all Toyotas and many other overhead camshaft engines using spacer shims for valve adjustments. In operation, the tip of the pliers push between the spacer shim and the camshaft as the pliers are squeezed closed. This action then moves the shim and its valve lifter down away from the camshaft lobe. In this position the separate wedge tool is placed between the valve lifter wedge and the camshaft which maintains a gap between the shim and the camshaft as the pliers are removed. The spacer shim then can be removed through this gap and replaced with one of the correct thickness.