IDC Select® classical A/B combination, C and D sheaves, and narrow 3V, 5V, and 8V sheaves are available in QD® bushing designs. They are precision machined from 30 gray cast iron, statically balanced, painted with a baked enamel finish and individually packaged. IDC Select® QD®® Sheave, Heavy Duty Type D-3 Arm/Spoke, QD® Bore, 8.35 in OD, 8 in Pitch Diameter, 2 Grooves, 1-3/4 in Face Width, SK Bushing, For Use With: AB Cross Section V-Belts, Cast Iron, Baked Enamel