A secure prop is one of those details you can't afford to overlook - and that's exactly what the Mercury Marine Propeller Nut Kit - 8M0179579 is designed for. This kit brings together the critical pieces needed to keep your propeller locked down tight, even under heavy loads, high-speed runs, or the constant shifting between forward and reverse.. Designed specifically for select Mercury outboards, every part in this kit fits like it should, eliminating the guesswork that comes with off-brand hardware. The prop nut, washer, and retaining hardware are all built from corrosion-resistant materials, made to handle the constant exposure to saltwater, heat, and vibration that comes with serious time on the water. It's the kind of hardware you install once and forget - knowing it's doing its job every time you throttle up.. What makes this kit worth using:. Factory-matched fit for select Mercury outboards - no improvising required. Corrosion-resistant materials stand up to salt, moisture, and