... 9001:2001 4.Diameter: 0.1 ~ 3.0 mmSpecificationsTungsten alloy Wire, Tungsten alloy wires Grade W1, W2.1, WAl1, W-61 Purity 99 ... rare eath industry , emission cathode , high-temperature forming rods, support wires, making filaments SortNumber of strandsDiameter(mm)Difference between 2 feet ...