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). Custom size crucibles are also available upon request. **Heavy Duty Crucible Tongs Available in our Amazon Store**. We always combine and reduce shipping on multiple purchases. Outside Dimensions – 5.25″ Dia. x 5.75″ Length – Inside Dimensions – 4.25″ Dia. x 5″ Dept Rosenthal Collection is a registered trademark protected by US Trademark Law.