[Great Compatibility] Perfectly fits all Mercruiser Alpha One, Pre Alpha, Generation 2, Bravo One, and TRS outdrives. Compatible with Mercury / Mariner outboards 150HP and up. Fits 1982 and earlier R, MR. Fits 1983–1990 Alpha Generation I. Fits Alpha Generation II (all years). Fits MC1 Blackhawk (all years). (Note: Not compatible with Bravo 2, 3, XR, or TR.) [High Performance] This 91-61069 Bearing Carrier Retainer Wrench Tool is designed to properly remove and install the 4 3/8 inch retainer nut for drive units and outboards. [Direct Replacement] Replaces part numbers 91-61069, 91-61069T, 18-9858. [Superior Material] Made of high-standard steel with black oxide finish for excellent strength, corrosion and rust resistance, impact resistance, and long-lasting durability. Color: Black Material: Steel Package Contents: 1 x Bearing Carrier Retainer Wrench Tool Note: Light reflection and different displays may cause slight color variations between the item and the image. Measurement may vary by +/- 1-3 cm.