Black Annealed Wire Hebei Yongwei Metal Product Co., Ltd has been manufacturing excellent quality black annealed wire. Black Annealed wire, also called black wire, offers excellent flexibility and softness due to its oxygen free annealing process and comes in the form of coil wire or cut wire. Mostly used in construction or daily use as binding material. Specification Wire Gauge SWG in mm BWG in mm In Metric System mm 8# 4.06 4.19 4.00 9# 3.66 3.76 - 10# 3.25 3.40 3.50 11# 2.95 3.05 3.00 12# 2.64 2.77 2.80 13# 2.34 2.41 2.50 14# 2.03 2.11 - 15# 1.83 1.83 1.80 16# 1.63 1.65 1.65 17# 1.42 1.47 1.40 18# 1.22 1.25 1.20 19# 1.02 1.07 1.00 20# 0.91 0.89 0.90 21# 0.81 0.813 0.80 22# 0.71 0.711 0.70 23# to 34# also available for galvanized iron wire.