Kangke manufactures a complete line of aluminum spinners from 1.5" to 6.5". At Kangke we use high-grade aluminum alloy and state-of-the-art machining and polishing techniques to ensure that our Spinners maintain maximum strengh, and a unified shape/density at high rpm's. Spinners come with a bushing set, a standard prop nut, and a center cap screw. Other prop nuts are available for purchase separately.