... surface finish. Generally for tungsten wire, Electromagnetic wire, plated silver wire, stainless steel wire, alloy wire.size rangetolerancecasing ref.sizeinchmmmmmm≤0.0008≤0.0200.0006Φ25×60 ... 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. ND die - natural diamond die for wire drawing