Introducing the Martyr Anodes Magnesium Streamlined Shaft Anodes with Allen Screw, 2-7/8\" ID. These high-quality anodes are perfect for outboard engines and components, and are a must-have for any boat owner. Made by the trusted brand Martyr, these anodes are designed to provide superior performance and durability. Crafted with precision engineering, these anodes feature a streamlined design and are made from high-quality materials. The Allen screw ensures a secure fit, while the 2-7/8\" ID ensures a perfect fit for most outboard engines. Whether you're replacing an old set of anodes or upgrading your boat's equipment, these Martyr Anodes are the perfect choice.