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GF Nylon Spinners have light weight aluminum back plate. No special prop nut or adapter is required. Spinner is held to back plate with two attachment screws. Machined groove supports edge of spinner. Back plate is knurled on both sides to grip both your prop and prop adapter making it easier to tighten than other spinners of this style. Size 2.5" (63mm) OD. Factory shaft hole in back plate is .252" (6.4mm). Overall Length is 2.465" (62.6mm).
See this and all other new sizes up to 75mm in Spinners-Fixed-Props. Within "E-Power-Everything".
 "GF Nylon Spinner 63mm")