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20 oz Short Graphite Furnace Crucibles for Hardin and MF Series Furnaces. These high density graphite crucibles are designed to be used with our electric MF series, or Hardin melting furnace. They are slightly more durable than our budget crucibles, maintain good thermal stability against harsh temperatures plus have good thermal conductivity to allow for quicker melting times. Featuring an outer groove they can be easily handled with our large stainless steel tongs. *Not recommended to be used with torch method or open flame furnaces. Ideal for small smelting applications. No more not being able to pour your small amounts of gold if your others crucibles are too long. Dimensions: Outer Flange Diameter: 2.8′ (65 mm) / Outer Length: 3′ (125 mm) / Inner Hole Diameter: 1.72′ (50 mm). Holds approximately 20 troy ounces of Gold / 10 troy ounces of Silver. Works well with our large stainless steel ring tongs.