With a cast iron Camshaft Gear and induction hardened billet Steel crank sprocket, this Hi-Techâ„¢ Roller Race Timing Set features a 3 keyway crank sprocket for 4-degree incremental adjustability and 4-degree maximum advance/retard. The pre-stretched, heat-treated double Roller chain with heavy-duty large pin design is capable of withstanding the heavy demands of racing Applications