Info:Martin 200M22 Type C Single Strand Welded Bushed Roller Chain Sprocket, 2 to 5-1/2 in Dia Bore, 18.888 in OD, #200 Chain, 22 Teeth, 2-1/2 in Pitch, Steel
Info:Martin 200M28 Type C Single Strand Welded Bushed Roller Chain Sprocket, 2 to 5-1/2 in Dia Bore, 23.688 in OD, #200 Chain, 28 Teeth, 2-1/2 in Pitch, Steel