This is a Two-piece Two-Blade White Nylon Spinner with a Nylon Backplate.|
One spinner cone
Two 1/8" x 9/16" S/T screws
Spinner Diameter: 2½"
Spinner Backplate Thickness: 3/16"
Crankshaft hole: ¼" (may be reamed to 7mm or 5/16")
Instructions state that this is a sport plastic spinner and not
designed for use with high performance engines or engines with
tuned pipes. Operation above 14,000 RPM is not recommended.