Features: 1) Machined from heavy duty steel with excellent mechanical and physical properties, strong and durable. Black Oxide finish prevents rust and corrosion. 2) Bearing Carrier Retainer Nut Wrench: Works well in removing and installing bearing carrier retainer on Bravo One, MC-1, R-MR, Alpha One/Gen Two, TRS drive units and outboards. It fits the 4 3/8" retainer nut, NOT fit Bravo 2, 3, XR or TR units. 3) Bearing Spanner Tool: Used to remove and install drive shaft 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. .