Power Mate Rims are preferred by most professional chain saw users. The rim “Floats” on the spline and allows the saw chain and rim to align with the groove of the guide bar extending the operational life of the Sprocket. This rims is equipped with wear-depth indicators, which make it easy to tell when the sprocket should be replaced, and has a radial port design which uses centrifugal force to throw off sawdust and debris.