Tritan sprocket 80bs09hx11/4, 1 pitch, 1-1/4 finished bore, 9 teeth tritan quality all steel sprocket for roller chain. Features black oxide finish for corrosion resistance. Includes keyway & 2 set screws. Teeth are hardened providing extra wear life, extending chain life and saving downtime and replacement cost. . Includes a recessed groove in hub for chain clearance.