Hardin HD-234 CR4kg 4 Kg Crucible for HD-234SS Manufactured, Tried, and Tested Specifically for the Hardin-234 Melting Furnace 4 Kilogram High Purity Graphite Crucible To Melt Gold, Silver, Copper at Extreme Temperatures Non-Slip Recessed Groove For Tongs Pour Groove for Easy Molten Metal Transfer