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: All YS 2-Strokes, OPS Maxi .30, Webra .61-1.20 INCLUDES: (1) Propeller Adapter Nut (1) Propeller Washer REQUIRES: 1/2" Wrench Spinner Cone & Bolt Backplate Propeller SPECS: Crankshaft Thread Size: 8 x 1.25mm Spinner End Thread Size: 10-32 Nut Length: 1.25" COMMENTS: 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. JAL 4/28/99 ir/jl kr2/27/03