Black Iron Wire Used in construction or daily use as binding materials.annealed wire ranges from 8# up to 38#(wire diameter from 0.17-4.5mm).customer orders are also acceptable. Soft Black Iron Wire Wire Diameter Strength Packing Weight Application 0.16mm-0.6mm 30-40kg Coils or spools 2-100kgs Binding wire for Christmas trees, 0.6mm-5.0mm 30-40kg Big package 100-800kgs 0.16mm-0.6mm 60-70kg Coils or spools 2-100kgs 0.6mm-5.0mm 60-70kg Big package 100-800kgs