The Grainger 16X428 is a 16-inch diameter, 3-blade, aluminum propeller for small aircraft. It has a pitch of 42 inches and is designed for engines up to 65 horsepower. The propeller is constructed from heat treated aluminum alloy for strength and durability. It uses a standard 5/16-inch bore with a set screw for easy installation. The propeller provides efficient airflow and thrust for light aircraft. With a lightweight and corrosion resistant aluminum design, this propeller is well-suited for many small piston engine aircraft.