"Mercury Marine Outboard One Piece Propellers 9"" X Black Diamond . Mercury Outboards Daiameter x Pitch Material Balde Model Mercu# 2.5hp 1990 & up, 3.3hp 1993 & up, 3hp 1990-92 7 3/8"" x 6"" AL 3 5037700 QA3180 4-6hp, 4-5hp 2-stroke 1987 & up, 4-stroke 1999 & up 8 3/8"" x 7"" AL 3 5037726 QA3182R 8 3/8"" x 8"" AL 3 5037734 QA3184R 6-15hp 2-stroke, 6-9.9hp 2-stroke 1999 & up, 8-9.9hp 4-stroke 1995-2004, 10-15hp Sea Pro/Marathon 1995 & up, 15hp 2 & 4 stroke 1989-2006 9"" x 8"" AL 3 5037692 QA2126R 9"" x 9"" AL 3 4744132 QA2128R 8-9.9hp 4-stroke 2005 & up 8 7/8"" x 7 1/2"" AL 3 7890361 QA2154R 8 7/8"" x 8 1/2"" AL 3 7890379 QA2158R 8 7/8"" x 9 1/2"" AL 3 8640302 QA2160R 9.9hp Bigfoot 4-stroke 2005 & up 10"" x 7"" AL 4 8640310 QA2180R 18-25hp 2-stroke, 9.9-15hp Bigfoot up to 2004, 20/25hp 2-stroke 1980 & up, 18hp 1980-85 10 3/8"" x 13"" AL 3 4744231 QA2106R 25-30hp 4-stroke 2006 & up 9 3/4"" x 9 1/2"" AL 3 8640369 QA2192R 25hp Bigfoot, 30-70hp, 402-500 1974-76*, 40, 50, 60hp 2 & 4-stroke 1977 & up, 402-500-700 1"