👍 INCLUSION & COMPATIBILITY — This comes with Marine Tech Mercury Bearing Retainer Wrench Replacement 91-43506T. It is used in removing and installing the driveshaft bearing retainer nut (824519-1) on some Mercruiser Sterndrives and Mercury outboard gearcases. This bearing retainer wrench is a replacement for Mercury 91-43506 GLM 90240 Sierra 18-9842. 👍 INSTALLS & REMOVES DRIVESHAFT BEARING RETAINER NUTS — You don't need to go to a dealer or marine mechanic to get the job done. This simple DIY tool allows you to install or remove driveshaft bearing retainer nuts like Pro. 👍 BUILT TO LAST — This tool is made of nickel plated steel that provides a combination of corrosion and wear resistance. 👍 BUILT & DEVELOPED WITH A MISSION — We are on a mission to support boat owners and mechanics in their boating lifestyle through the tools we create like this Bearing Retainer Wrench. 👍 LIFETIME WARRANTY — As a small business located in Charleston, South Carolina, USA, we take pride in all our tools. They are all built to last, backed with a lifetime warranty. Designed for Mercruiser and Mercury — This retainer removal tool is perfect for removing and installing the driveshaft bearing retainer nut (824519-1) on certain Mercruiser sterndrives and Mercury outboard gearcases. Reliable Replacement — A replacement retainer wrench that directly replaces part numbers like Mercury 91-43506, GLM 90240, and Sierra 18-9842, ensuring reliable compatibility. Effortless Maintenance — Designed for a precise fit, this remover tool makes removing and installing the bearing nut smooth and hassle-free. Built for Marine Durability — Made from durable marine-grade materials, these specialty tools resists wear and corrosion for lasting performance. Ideal for Pros and DIYers — A great Marine Tech Tools wrench tool for both professionals and DIY users, it simplifies essential maintenance on Mercruiser and Mercury systems.