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The heavy-duty spring in the base swings the arm so that the molten metal is forced into the flask. The broken arm construction assures that the metal will flow in a straight line, producing dense castings. NOTE: For safety reasons, casting machine springs must be replaced at the factory. Accommodates flasks from 1-1/4" (32 mm) diameter up to 3-1/2" (89 mm) diameter and 2 - 3/4" (70 mm) high. The set includes balance weights, crucible No. 22454, three steel flasks, three flask cradles, three sprue bases, and flask tongs. Shipping weight 27 lbs. (12 kg).