Yamaha - M/T Series Saltwater II Propeller - 3 Blade - 15" x 21 Pitch - LH Rotation - 6CF-45972-20-00. This stainless-steel, three-blade propeller is designed for today's larger offshore boats. It provides a longer cruising range, superior midrange fuel efficiency, and better handling in rough seas. Features a new SDS design that requires no special hardware to function.. 6CF-45972-20-00 - SWS2 W/SDS (3X15 X21 -TL)