Wide Compatibility: This tool is designed to work perfectly with Alpha One Gen 1 and Gen 2, Mercury 2.0L, 2.4L, 2.5L (without preloaded pin), and all Mercury 3.0L models. It is compatible with retainer part numbers 8245191, 824519, 11-42632, and 853651, ensuring versatile use across various applications. Efficient Performance: Engineered for easy and precise removal and installation of the threaded bearing retainer nut located under the water pump housing. Perfectly suitable for Mercruiser Sterndrives and Mercury Mariner outboard gearcases, making maintenance quick and hassle-free. Premium Quality Materials:Crafted from high-grade steel, this tool offers exceptional strength and durability. It meets or exceeds OEM quality standards, ensuring impact resistance and longevity for consistent performance over time.