The SOLAS Yamaha Type-D/E 100-300hp Fixed-Hub Propeller Hardware Kit sets you up to install a new boat propeller (not included). This prop hardware kit fits with Yamaha Type-D/E 100-300hp engines. Includes 1 thrust washer, 1 castle nut, 2 space washers, and 2 cotter pins. For SOLAS dual prop and B3 installations, front and rear propellers must both be manufactured by SOLAS. Also, they must be made of the same material: either aluminum or stainless steel but not both. Kit helps set you up to install a new boat propeller (not included) Made for SOLAS propeller installations Fits with Yamaha Type-D/E 100-300hp engines 1 thrust washer, 1 castle nut, 2 space washers, and 2 cotter pins