Black annealed wire features: black annealed wire is rust proof within 6 months without any oil coating. The tensile strength is 300-400 newton per square millimeter. Black annealed wire sizes: wire diameter ranges from 0.70mm to 40mm. Application: black annealed wire is mainly used as industrial wire, construction wire, industrial bale tie wire and constructional tie wire, etc. Packing: different coil diameter or coil weight available for customers choice.