This is a high-quality Archer replacement drum & rim sprocket. This is a 7-tooth, .325" pitch sprocket and it comes with a needle bearing. The sprocket fits the following chainsaw models: Echo CS450, CS451, CS451VL, CS452, CS500, CS510, CS550, CS590, CS310, CS600, CS610, CS610, CS650, CS660, CS680
Archer chainsaw chains, guide bars and chainsaw accessories are very quality products and are available worldwide.