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Info:Martin 3 B 124 SK Arm/Spoke Type A-3 Conventional Sheave, 1/2 to 2-5/8 in QD® Bushed Bore, 12-3/4 in OD, 3 Grooves, 12.4 in Dia Pitch, 2-1/2 in W Face
Info:Martin 3 B 136 SK Arm/Spoke Type A-3 Conventional Sheave, 1/2 to 2-5/8 in QD® Bushed Bore, 13.95 in OD, 3 Grooves, 13.6 in Dia Pitch, 2-1/2 in W Face