This prop turned out to be perfect for my setup: 2006 Tahoe Q4 OBSF with a 115HP Mercury 4-stroke. Gained 1 MPH on top speed, and over 400 RPM on WOT. A bonus was that maneuverability increased noticeably as well. With this prop, it is much easier to find the "sweet spot" when trimming. With my current setup, this will be the only prop that I will purchase in the future. I have tried aluminum, SS, nylon from several manufacturers but this was by far the best performer with my setup.