MegaCast Graphite Foundry Crucibles are made from a combination of graphite and clay, and are recommended for melting your precious, or non-precious metals and can handle large batches of material. Their thick inner walls can handle direct heat and open flame foundries. They can be used with our propane melting furnaces as well as a standard torch method. Rated to withstand temperatures up to1560°F - 2912°F - (850°C - 1600°C)..Not for use in a Coal Foundry,.Outside Outside Dimensions - 3.5" Dia. x 3.75" Length - Inside Dimensions - 2.75" Dia. x 3.25" Depth **Heavy Duty Crucible Tongs Available in our Amazon Store**.