BikeMaster is a brand that focuses on quality, performance, and value priced products for motorcycles and ATV's. Made from durable, thick, 6061-T6 aircraft aluminum sheet. 7" diameter with large, highly visible markings. Extremely accurate marking makes getting timing right the first time easy. Lightweight and coated with durable finish. Can be used for crankshaft positioning, ignition and camshaft timing. Manufacturer's lifetime warranty.