This is a Great Planes 3-1/4" (83mm) Nylon Aluminum Spinner. A sturdy aluminum backplate holds the spinner in round - which means it turns truer, with less vibration. The engine shaft hole is stepped from 5/16" to 1/4", to perfectly center the opening if enlarging is needed. Spinner attach securely to backplate with the included screws.
Diameter: 3-1/4" (82.55mm)
Backplate Thickness: 1/8" (3mm)
Backplate Hole Diameter: 5/16" (8mm)
This product was added to our catalog on August 1, 2013