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Info:Martin 40A49 Type A Single Strand Solid Reboreable Roller Chain Sprocket, 0.71875 to 7.258 in Dia Bore, 8.088 in OD, #40 Chain, 49 Teeth, 1/2 in Pitch, Steel
Info:Martin 40A56 Type A Single Strand Solid Reboreable Roller Chain Sprocket, 0.71875 to 8.373 in Dia Bore, 9.203 in OD, #40 Chain, 56 Teeth, 1/2 in Pitch, Steel