Durability and higher top speed
Increase in fuel economy
For engines: '77 & later, 30 hp
Performance for 30-70 hp outboards
Stiletto Triad II Propellers. An exciting new level of performance for 30-70 hp outboards. Durability, higher top speed, and an increase in fuel economy highlight this series of 3-blade props. Mercury/Mariner: For engines: '77 and later, 30 hp with thru hub exhaust.