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Info:Martin 10A20 Type A Single Strand Solid Stock Bore Roller Chain Sprocket, 16 mm Dia Bore, 111.164 mm OD, #10B-1 Chain, 20 Teeth, 15.875 mm Pitch, Steel
Info:Martin 10A27 Type A Single Strand Solid Stock Bore Roller Chain Sprocket, 18 mm Dia Bore, 146.428 mm OD, #10B-1 Chain, 27 Teeth, 15.875 mm Pitch, Steel