55 tooth, metal gear. Approximate measurments: Outside diameter 5-11/16". Center of tooth to center of tooth spacing = 5/16". Insert's shaft diameter = 1& 1/2", with one 3/16" by 3/8" key. Shaft diameter of the gear if the insert were removed is 2-1/2", with one 1/2" by 1/4" keyWidth of gear = 1-1/4". Mr. Gears Inc, 2149-2129 Rev C.
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