25-30 HP Four Stroke 2006 and earlier Stainless Steel 3 Blade Prop Right-Hand Rotation Includes Flo-Torq I rubber hub The Vengeance three-blade stainless steel propeller is an excellent choice for the boater who wants to upgrade from an aluminum prop. The Mercury Vengeance is a fine propeller for outstanding durability and good overall performance on most outboard and sterndrive powered boats.Proven blade design. Better acceleration and handling than 3-blade aluminum.