This is a high-quality Archer replacement drum & rim sprocket. This is a 9-tooth, 1/4" pitch sprocket and it comes with a needle bearing. The sprocket fits the following chainsaw Echo models: CS301, CS303T, CS305, CS306, 330T, 340, 341, 345, 346, 350T, 355T, 360T, 361, CS370, CS390, CS400, CS420, CS450, CS4510
Archer chainsaw chains, guide bars and chainsaw accessories are very quality products and are available worldwide.