Aircraft Model(s): PA-23-160 Apache, PA-23 Apache. Applicable Engines: O-320. 2 -Polished Spinner 836-29P, 2 - 2-Bladed Propeller HC-C2YL-2CUF/FC7663-4, 1 - STC Paperwork SA00721CH. 72 inch diameter 2-bladed, aluminum hub propeller.