This is a high-quality Archer replacement spur sprocket. This is a 7-tooth .325 pitch sprocket, and it comes with a needle bearing.  The sprocket fits the following chainsaw models: Husqvarna 435, 435 II, 435E, 440, 440E, 440 II and Jonsered CS2240 Replaces Husqvarna part numbers 504712402 and 505441501.