Sprue Burning Mandrel This sprue mandrel is great for burning out a conical cavity on rubber molds. It eliminates the use of a sprue former in packing the mold. Ideal for jewelry makers and metalsmiths!
This sprue mandrel is great for burning out a conical cavity on rubber molds. It eliminates the use of a sprue former in packing the mold. Ideal for jewelry makers and metalsmiths!
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