CNC 4717-D-Rev propeller, 1.6 pitch, magnalium aluminum. This prop has less blade in the tongue area, which allows for a bit higher rpm for more top-speed. But a bit less take off out of the hole. Machine cut to high tolerances makes this prop ready to use right out of the box. The Magnalium 7075 alloy makes this material upwards of 30% stronger than standard 7075 aluminum. ATTENTION: Right and rotation. These spin clockwise when looking at them from the back of the boat. Used for twins or boats that require opposite rotation than normal. Fits 3/16"(.187" 4.76mm) Smooth Bore Propeller Shafts.