The Hangar 9 3-1/2" Aluminum Spinner for P-51 is CNC machined from high-quality bar stock aluminum for strength, precision, and a clean finish. Its classic P-51 shape adds an authentic look to a wide range of RC aircraft. Featuring a standard 10-32 single bolt mounting system, it’s easy to install and built to last. Adapter kits are available separately to fit five common crankshaft sizes, offering added compatibility for your setup.