Aluminum propeller 19638A40 can be used on your Mercury and Mariner 9.9 hp through 25 hp outboards including 9.9 hp and 15 hp 4-stroke Bigfoot (1999 through 2004), 20 hp and 25 hp 2-cycle Classic (1980 through 2006) and the 25 hp SeaPro Marathon\nItÂ