Each Solas boat propeller is balanced and precision made with superior materials for a higher strength and thinner blade that is smooth, fast, efficient and tough. Solas aluminum propellers are squeeze-cast and coated with four paint layers. The Amita 4 propeller features a stronger blade with great acceleration and mid-range performance. It provides great stern lift and handling. 10 Diameter. 13 Pitch. 10-Tooth Spline. Right Hand Rotation.