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 3+ propeller offers a larger blade than the Amita 3 for superior thrust and is suitable for heavy boats. All Amita models feature a stronger blade with better performance with outstanding acceleration and top speed. 15.3" Diameter. 21" Pitch. 15-Tooth Spline. Right Hand Rotation.