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 accessories are made with quality and sold all over the world!