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Mercruiser Bearing Retainer Spanner Wrench Tool Suit: Fits all mercruiser Alpha one, Pre Alpha, Generation 2, Bravo One, Trs outdrives will also fit Mercury / Mariner outboards 150HP an. Will fit the 4 3/8" retainer nut. Will not fit Bravo 2, 3, XR, or TR. The tool set are used to remove and install driveshaft housing (upper) bearing retainer nut (By U joint shaft) on #1 (1982 and earlier), R, MR, Alpha Gen 1 (1983 -1990), Alpha Generation ll (all), MC1, and all Bravo and Blackhawk units. If you have any questions, please don't hesitate to contact us to speak with our friendly technical support team