Fixed Hub Prop Hardware Kit - Mercury, Type B | Solas 17012501 KIT HARDWARE MERC MB-PKT SOLAS 17012501 MB-PKT Propeller Kit for Mercury 9.9-25 HP Prop hardware kit for Solas B-Series propellers Designed to fit Mercury 9.9 HP to 25 HP engines Includes thrust washer (MBTW), washer (MBWS), and nut (MBNT) This hardware is for OEM and Solas pressed rubber hub props only Will not fit Rubex propellers