CastiaInvTools-fabric-1.16.x-2.4.3.jar is a beta file of the Minecraft mod Castia Inventory Tools for Fabric, made for Minecraft 1.16.3, 1.16.5, 1.16.4, 1.16.2. It was published on October 6, 2021 and is 0.3 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the Castia Inventory Tools mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.