HIPA Clutch Drum Sprocket Bearing with Clutch Assembly for STIHL 029 039 MS290 MS310 MS390 Chainsaw Fitment models: STIHL 029 039 MS290 MS310 MS390 chainsaw Crank Diameter: 10 mm, Drum I.D: 2.985" Pitch: 3/8", Teeth: 7, sprocket bearing:10x13x10 Package include: 1pc clutch drum sprocket, 1pc sprocket bearing, 1pc clutch