Geared design keeps blades synchronized, allowing the blades to fold back properly regardless of the propeller position, even at low speeds. Sizes from 14" to 20" diameter All Stainless Steel construction for superior life using low carbon 316L grade stainless steel. Being a similar metal as the internal components and shaft of saildrive units, it is less likely to promote electrolysis, the most common cause of prop failure Large Blade area for excellent thrust, with unique blade geometry resulting in a smoother and more reliable opening of the blades, particularly when shifting into reverse, whilst travelling forward. Ultra High Molecular Weight Polyethylene thrust plates* on either side of the blades prevent metal-to-metal wear of blade on body. Blades pivot on replaceable Nibral bushes*, these can be easily pressed out and replaced, compared to the traditional over sizing or welding/redrilling