Usually refers to various dies for drawing metal wires, and wire drawing dies for drawing fibers. The center of all drawing dies has a certain shape hole, round, square, octagonal or other special shapes. When the metal is pulled through the die hole, the size becomes smaller and even the shape changes. When the soft metal (such as gold and silver) is pulled, the steel mould is enough, and there are many holes with different diameters on the steel mould.
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