This unique tool by Lowbrow Customs allows you to rotate your crankshaft, turning your engine over while it is in the chassis or on the workbench. This engages the splines on the primary (left) side of the crankshaft and can be turned using a 3/4 inch wrench on the hex. Works with pre-unit and unit Triumph motorcycles. Steel, cadmium plated. Made in the USA.