Husqvarna OEM Rim Sprocket 18720 (3/8" x 7 Tooth) Small Spline for Chainsaws 640200036

OEM Rim Sprocket from Husqvarna. Rim sprockets float on the splined hub of the drum and move side to side, allowing the chain and rim to align with the bar as the chain travels around the bar's groove. The rim gets most of the sprocket wear, and by being replaceable, it extends the overall life and value of the sprocket system.