Diameter:11 1/8. Pitch:13. Rotation:Right. Spline tooth:13. Fits for outboard engine:Mercury

25-70HP 3-1/4" Gearcase 25hp Bigfoot(4 stroke)...1999-2005 30hp Bigfoot(4 stroke)...2010-newer 30hp(2&4 stroke)...1994-2005 30hp(sea Pro/Marathon)...1994-newer 35hp...1984-1989 402&500 Models...1974-1984 40hp(2&4 stroke/not bigfoot)...1977-newer 40hp(Sea Pro/Marathon)...1977-newer 45hp...1986-1989 48hp(Mariner)...all years 50hp(2&4 stroke/not bigfoot)...1977-newer 55hp(Mercury/Sea Pro/Marathon)...1995-newer 60hp(4 stroke)(not bigfoot or Sea Pro/Marathon)...1978-newer 60hp(2 stroke)...1978-newer 70hp(Model 700)...1983 Force40/50hp...1995-1998 70hp...1991-1995 75hp...1996-1998