This is a high-quality Archer replacement spur sprocket. This is a 6-tooth 3/8"LP pitch sprocket and it comes with a needle bearing.  The sprocket fits the following chainsaw models when these saws are equipment with a 3/8" pitch sprocket. 

POULAN:255, 295, 2600, 2500, 2750, 2775, 2900, 3050, 4620AV, P600, PP295, PP210, 2150

Husqvarna 36, 41, 136,137, 141, 142 

Jonsered 2035, 2036, 2137, 2040, 2141 

Partner 365 405 

Replaces OEM number 530 04 70-61 and Oregon number 41569X and Rotary 36-1603