This is a Two-piece Two-Blade Red Nylon Spinner with an Aluminum Backplate.
Features : No spinner nut required. Engine shaft hole is stepped to perfectly center the opening if englarging is needed. Sturdy Aluminum backplate holds the spinner in round-which means it turns truer, with less vibration.
Includes : One Red Spinner cone One Aluminum backplate Two 3/32 x 5/32 S/T screws
Spinner Diameter : 1-3/4 in
Spinner Backplate Thickness : 1/8 in.
Crankshaft Hole : Stepped from 5/16 in. to 1/4 in.