A propeller is only as secure as the hardware holding it in place - and that's exactly where the Mercury Marine Propeller Nut Kit - 8M0179579 comes into play. Designed specifically for select Mercury outboards, this kit gives you the right combination of fit, durability, and corrosion resistance to keep your prop locked down, no matter how hard you push your engine.. This isn't just any nut and washer set - every piece is engineered to Mercury's exacting specs, ensuring proper alignment and a snug, vibration-resistant fit. That precision matters when you're running at speed or shifting in and out of gear, especially in conditions where reliability is everything. The corrosion-resistant materials stand up to constant saltwater exposure, so you're not dealing with seized threads or worn-out hardware after just a few seasons.. What makes this kit a smart choice:. Factory-matched to fit select Mercury outboards - no modifying, no guesswork. Corrosion-resistant construction holds up in salt