This is a Master Airscrew Injection-Molded Fiberglass-Filled Nylon Propeller. This is the "K" Series of props for 4-stroke engines. Excellent for Any Type of Application, from Training and Sport Flying to Serious Competition.
Center Hole Diameter : 3/16 in. approx.
Propeller Diameter : 15 in.
Propeller Pitch : 8 in.