This is propeller that was in my dad's garage and labeled new prop 40hp W.Bend. I measured the shaft size and looks to be approximately 3/4" . And from center to edge of blade is 5 1/4" so doubling that would be 10 1/2". As far as pitch the # on propeller is 90265-1 and don't what that means

See Photo's for Condition and fit, feel free to ask questions.