3scds-1.12, screw conveyor shaft – 1 1/2″; fits “ultimate” shaft mount reducer size 3 3scds-1.12, screw conveyor shaft, 1-1/2″; fits “ultimate” shaft mount reducer wsmr3-box size 3; conforms to cema standards; machined from high tensile strength alloy steel; three-hole design for easy installation onto screw