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Designed to be used with our MF Series and Hardin Melting Furnaces and Digital Electric Smelting Furnaces. Designed with grooved flange for crucible tongs and pour spout for easy pouring applications. Dimensions: Outer Flange Diameter: 2.83′ (72 mm). Outer Length: 6.10′ (155 mm). Inner Hole Diameter: 2.16′ (55 mm).*Not recommended to be used with torch method or open flame furnaces.