50 IDLER SPROCKET 17T 1/2 4" x4" x0.5", A & I Products, Mfr#: A-IS501712

50 IDLER SPROCKET 17T 1/2, Bore: 1/2" Bearing, Chain Size: 50, Dim A (1): 17 Teeth, Dim B (2): .50" bore, Replaces: AH87204, Teeth: 17