Great Planes 3-1/4" 82mm Aluminum Back-plate, White Nylon Spinner

This Great Planes’ 1-Piece White Nylon Spinner with Aluminum Backplate.

FEATURES: White nylon 2-blade spinner.
Aluminum backplate.
A sturdy aluminum backplate holds the spinner in round, which means
it turns truer, with less vibration.
Spinners attach securely to backplate with the included screws.
One year quality guarantee.
INCLUDES: (1) Spinner with Backplate
SPECS: Diameter: 3-1/4? (82mm)

Backplate Thickness: 1/8? (3mm)
Backplate Hole Diameter: 5/16? (8mm)