metalblocks-1.0.jar is a release file of the Minecraft mod Metal Blocks for Tinker's + Geolosys, made for Minecraft 1.12.2. It was published on October 23, 2020 and is 0 MB in size. For the full description, screenshots and every other version, visit the Metal Blocks for Tinker's + Geolosys mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.