Gold, Silver Brass Bar, This is a new graphite crucible designed for the hand held melting furnace. * Can be used for all metal types, maximum working temp 3000° c. * This model has the groove in the top for the wire type crucible tongs. * Measurements : top outside diameter (mm) : 73mm. top inside diameter (mm) : 45mm. height under the top (mm) : 134mm. height with the top (mm) : 156mm.