No. 12 Ingot Mold – holds 4 ingots measuring 10 3/4″ long x 3 1/2″ wide x 1 1/2″ thick. Ingot Molds are an essential item in all shop foundries for handling and storing melted metal. Scrap metal can be fluxed, cleaned and poured into ingots, then stored for future requirements. The No. 12 size is used for pigging ingots because of the large capacity. The No. 6 is used for draining crucible after the final heat.