You can now give your custom items a damage bar, like for vanilla Minecraft tools!
If you're running Minecraft 1.14, you'll need to update your server resource packs. Check out the instructions of creating a resource pack on the main plugin page, and download these starter files:
amazonaws.com/projects.store/spigot/CustomItemsModelFiles.zip. If you don't want to migrate over to the new format, that's ok! Just set "useOldResourcePackFormat" to
true in the config.yml