This Is An X-Long Propeller Adapter Nut from Dave Brown Products.
FEATURES:
Plain Black, CNC machined steel construction. Use with 3-1/4" to 4" spinners. This prop adapter kit tightens the backplate and propeller onto the engine, then using a single bolt-on design, holds and centers each spinner perfectly on its baseplate. Will fit the following engines: OS Max .61-.90, SuperTigre .61-.90 and G2300 Fox .60-1.20
