Pro Spur Sprocket / 3/8" LP Pitch, 6 TeethPack Size:1Echo 17500539132, GB EC202-R6N, Herr 359-M6, Oregon 106906X, Ref No SEC202-16NNHC 085-5977, Rotary 1627Echo CS300,CS305, CS306, CS330T, CS340, CS341, CS345, CS346, CS3000, CS3350, CS3400, CS3450 and CS3500Pitch: 3/8" LP, Crank Diameter: 10 mm, Drum ID: 2.366 ", Teeth: 6, Bearing included