Dave Brown adapter is 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:Enya .35-.60, .60-1.20 4-Strokes (Non-R Engines).
Although it will depend on the thickness of your prop and the spinner size, as a general rule, always use the longest adapter nut possible.