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Info:Martin 100Q12H MST® Q1 Bushed Solid Type 4 Split Single Roller Chain Sprocket, 0.75 to 2.688 in Dia Bore, 5.415 in OD, 100 Chain, 12 Teeth, 1-1/4 in Pitch, Steel
Info:Martin 100Q13H MST® Q1 Bushed Solid Type 4 Split Single Roller Chain Sprocket, 0.75 to 2.688 in Dia Bore, 5.821 in OD, 100 Chain, 13 Teeth, 1-1/4 in Pitch, Steel