The Oregon 640200212 Power Mate Rim Sprocket System delivers efficient and reliable chain drive performance with a .325" pitch, 7-tooth replaceable rim, and SM7 small spline clutch cup design. Its floating rim sprocket optimizes chain-to-bar alignment, reducing wear while extending service life and lowering operating costs. Designed for durability and versatility, it fits select Husqvarna, Jonsered, Partner, and Poulan/Poulan Pro chainsaw models for dependable operation.