Mercury Spitfire 4-Blade Aluminum Pontoon Propeller 13.8 x 10P 488M8026555 Genuine Mecury Marine propeller. This is a factory original equipment prop, not aftermarket. 13.8" diameter x 10" pitch; 4 blade; aluminum; RH rotation; includes Flo-Torque II hub kit # 835257K1 (thrust washer, splined hub, hub insert, prop nut and keeper) Fits: 40-60 HP BF (Big Foot), 75-125 HP The Spitfire is designed specifically for boaters using mid-range 25 - 125 HP outboards ? including aluminum fishing and pontoon boats. The Spitfire line also includes three propellers that are designed for the unique demands of pontoon boaters. Spitfire pontoon propellers provide extra lift and ventilation resistance, to improve both performance and handling.