Fort Knox Slab is an INGOT, which is a metal bar or block that has been cast into a specific shape and size. It is usually made of gold, silver, or other precious metals. Fort Knox Slab is a type of INGOT produced by the United States Mint at the Fort Knox Bullion Depository in Kentucky. It is used to store large amounts of gold and other precious metals. The Fort Knox Slab is a secure and reliable way to store valuable metals.