New Solas Propeller for the popular Evinrude Johnson OMC 9.9 hp 15 hp etc. With 13 Splines it fits the 2 stroke motors 1974 and up and the 4 strokes 2. This is a 9.25" x 8" pitch propeller best if you are using these motors as a trolling or back up motor on a larger boat or a smaller sized boat packed with 2 or 3 individuals and gear. It provides much better acceleration and enables the motor to reach it's full revs at high altitudes too, compared with the stock item. I got this and a 9" pitch for use with my inflatable boat, however the 9" pitch worked fine so I have no use for it.