Features: black annealed wire is rust proof within 6 months without any oil coating. The tensile strength is 300-400 newton per square millimeter. Wire sizes: wire diameter ranges from 0.70mm to 40mm. Forms of supply: straightened cut wire, u type wire, coil wire, etc. 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