The triple propeller is part of standard equipment for most Mercury / Mariner / Mercruiser engines. Recommended for use on ships up to 250 HP and up to 50 MPH for all types of hinged marine engines and built-in Mercruiser Alpha One and Bravo One gear units. It is a high quality aluminum cast in an attractive design (Black Phantom) with easy maintenance. Propeller diameter - 23 cm.