... die. it is widely used in wire drawing industry, such as aluminum wire, copper wire, stainless steel wire, alloy wire etc..size rangetolerancecasing ref. Size inchmmmmmm ... +/-5back relief angle50+/-2050+/-20soft wire: copper wire, aluminum wire, brass wire, gold wire etc.hard wire: stainless steel wire, copper plated steel wire, tungsten wire etc. stainless steel wire drawing diamond dies