Black Annealed Wire Specification:0.30mm-5.0mm Tensile strength :300-450N/mm2 Packing: Spools, coils. Packing:50-500kg/coil Black Annealed Wire black annealed wire products, soft-wire annealing.main purposes : Building and fire organizations for black fiber cloth such as silk and silk tie made from high-quality wire, primarily for the construction industry and for tying silk tie lines. 20#,21#,22 ...