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Diamond wire drawing dies:

Diamond dies are widely applied to a variety of industries, implemented as drawing tools for soft wire products (copper and aluminum wire), as well as hard wire products (stainless steel, tungsten and copper plated steel wire). Dies are made of natural diamonds or synthetic diamonds, offering high performance in hardness and abrasion.

Diamond's feature is similar with Natural diamond. Drawing surface is very fine, good polishing. Hole can keep well in round shape when drawing.