This Is A Long Propeller Adapter Nut from Dave Brown Products.
FEATURES:
Plain black, CNC machined steel construction. Use with 2-3/4"to 3" 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 .25-.60, SuperTigre .25-.60, Fox .19-.50, Enya .25-.53, K&B .19-.65, OPS .40-.60, Webra .28-.80
