Give your Model a More Finished Scale Look with OS Max Spinner Nuts. They"re ideal for those kits that don"t require spinners, such as the J-3 Cub. FEATURES: Provide Greater Safety Than a Bare Prop Shaft. Has an Acorn-Like Look Machined Aluminum Alloy Construction Used on .20-.48 Sized INCLUDES: One 1/4"x 28 Aluminum Spinner Nut One Tightening Tool COMMENTS: Six Sizes AvailableOS EnginesPart OSM23024008