This is a Two-piece Two-Blade Black 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 Black Spinner cone / One Aluminum backplate / Two 3/32 x 5/32 S/T screws / / SPECS: Spinner Diameter: 2½" / Spinner Backplate Thickness: 1/8" / Crankshaft hole: stepped from 5/16" to ¼" / Weight: 1.05oz (30g) / / kh01-30-02