− Decrease quantity for Propeller Lock, 3/4 x 16 Thread, MerCruiser, Alpha I, Bravo I, OMC Cobra, King Cobra, Volvo SX, Each Quantity + Increase quantity for Propeller Lock, 3/4 x 16 Thread, MerCruiser, Alpha I, Bravo I, OMC Cobra, King Cobra, Volvo SX, Each Add to cart