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*Includes (1) - Sprocket # 13624 *Genuine Oregon Replacement Part *Replaces the following part numbers: Stihl 0000 642 1239 *Works with many Chainsaws *Please refer to below list for compatibility. *Oregon Power Mate Rim (Standard Spline) 325 x 9 Tooth. Oregon Power Mate rim sprockets for chainsaws. Rims 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 sprockets wear, and by being replaceable, it extends the overall life and value of the sprocket system. Standard splined rims have a sprocket bore of approximately 7/8". This rim is a .325 x 9 tooth configuration. Replaces the following part numbers: Stihl 0000 642 1239. Large splined rims have an interior diameter of approximately 7/8". Available sizes: .325 x 9 tooth (this item) ; .375 x 7 tooth ORF 68210 ; .375 x 8 tooth ORF 22273 ; .404 x 7 tooth ORF 22270 ; .404 x 8 tooth ORF 13313. Also available: Small splined rims (search OSR) They have an interior diameter of approximately 3/4" and are available in .325 x 7, .325 x 8 and .375 x 7 tooth configurations.