The product is a variable pitch stainless steel propeller with 15 splines and an approximate diameter of 14 1/2 inch. This should fit mercruiser or any other engine that takes a 15 pline propeller. The propeller is stainless steel so is corrosion resistant. 
Note that the propeller does not include the adjuster and is being sold as parts for that reason. Blades all move freely and there is nothing wrong with it other than needing an adjuster.