[Great Compatibility]Perfectly fits for all mercruiser Alpha one, for Pre Alpha, for Generation 2, for Bravo One, for Trs outdrives. Fits for Mercury / Mariner outboards 150HP and up. Fits for 1982 and earlier R, MR. Fits for 1983-1990 Alpha Generation I. Fits for Alpha Generation II (all years). Fits for MC1 Blackhawk (all years). (Note: Not fits for Bravo 2, 3, XR, or TR.) [High Performance]This 91-61069 Bearing Carrier Retainer Wrench Tool designed to properly remove and install the 4 3/8 inch retainer nut for drive units and outboards. [Direct Replacement]Replaces for part number part number 91-61069, 91-61069T, 18-9858. [Superior Material]Made of high standard Steel coating with black oxide finish, great strength, prevent corrosion and rust, impact resistance, sturdy and durable. Colour:black Material:steel Package Contents: 1 x Bearing Carrier Retainer Wrench Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.