34162X Oregon Power Mate Sprocket System for Stihl

34162X Oregon Power Mate Sprocket System for Stihl.  Fits Stihl 029,  034,  034 SUPER,  036,  036 PRO,  039,  MS 290,  MS 310,  MS 311,  MS 360,  MS 360 C,  MS 360 Pro,  MS 360 QS,  MS 390,  MS 391.  Pitch: 3/8", Size: Small 7 Spline, Tooth Count: 7. Two-piece design includes a drum with a replaceable rim, allowing rim to be replaced multiple times before the entire unit is replaced.  Extend operational life by maximizing chain and bar groove alignment For best performance, replace every three rims.