Transparent Spinner Size Transparent Spinner 2 1/4" (57mm) Transparent Spinner 2" (51mm) Transparent Spinner 1 3/4" (44mm) Transparent Spinner 1 1/2" (38mm) Two piece precision Transparent Spinners with lite aluminum backplate. Backplates have machined precision groove for nylon front. They run very true, with much less vibration. No spinner prop nut is required.