513470X Oregon Power Mate Rim Sprocket System 3/8″ 7 Small 7 for Stihl 455, 460

513470X Oregon Power Mate Rim Sprocket System 3/8" 7 Small 7.  Fits Stihl 455,  455 RANCHER,  460,  460 RANCHER.  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.