Iron Chests is a modification for Minecraft that adds in new types of chests, with corresponding upgrades for them. Iron Chests can be used as a standalone mod, however, a mod that spawns Copper, like IndustrialCraft 2, is required to craft the Copper Chest, and a mod that spawns Silver, like Metallurgy 4, is required to craft the Silver Chest.

If you want to use OptiFine with this mod, use version C3 onwards for 1.4.7, as this version fixes the Chest Upgrades crashing the client when applied to a target chest.