BikeService Piston Locating Tool M10 X P1.0 BS2250Designed for visually indicating the relative crankshaft and piston position at top dead centre Insert the tool and adjust accordingly so that it contacts the dome of the piston before it can pass through TDC Fine tune by eye or with degree wheel until actual TDC is reached Ideal for camshaft timing in addition to the timing marks POM tip prevents piston damage Thread size: M10 x 1. 0