FMS 4250 Series Outrunner Extended Shaft Prop Adapter for FMS / Airfield Hubs Included: 1 - FMS 4250 Series Extended Length Propeller Adapter,Hex Nut, 4 Mounting Screws Use with 1400 / 1450mm FMS / Airflield models For hubs with 8mm hole Run the factory Hub / Prop assembly for that scale look CNC Machined from Billet Aluminum