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The key to maximizing the performance of your prized watercraft is using the right boat propellers. At Discount Inboard Marine, we carry a wide selection of 3-blade propellers and 4-blade propellers to choose from. And all of our inboard boat propellers have a 30-day satisfaction guarantee. So, whether you're replacing a broken inboard propeller or upgrading your standard-issue model, our team can help you select the right boat propellers for your watercraft. And be sure to check out our Guide to Choosing Your Inboard Propeller and instructional video for removing an old inboard propeller for more information. Note that OJ no longer manufactures NIBRAL OJ stainless propellers. The boat propellers listed are standard cup unless otherwise noted.