Mercury/Mariner Black Max three blade aluminum prop, 10 5/8 x 12. More than just an aluminum propeller, the Black Max is the best three-blade aluminum prop available anywhere. And anywhere is usually where youll find it. Whenever you need good overall performance, Black Max is there. Features high quality die-cast three-blade aluminum in an attractive Phantom black finish. Durable and easy to maintain and repair. These are all right hand rotation props. Designed to fit: Mercury/Mariner 25-40 HP Outboards, 25 HP Bigfoot (4-Stroke), 30-40 HP, SeaPro/Marathon 30-40 HP, 30 (4-Stroke) 1994-2005, 40 (4-Stroke) Mercury/Mariner 50-60 HP Outboards, 50-60 HP, 50-60 HP (4-Stroke), SeaPro/Marathon 55 HP