The iron wire has a strong abilty to bind and ... according to different usage, it contains the ingredients just like: iron, cobalt, nickel, copper, carbon, zinc, and also other elements ... construction, transportation, mining and other areas of manufacturing barbed wire U SHAPED WIRE Straight cutted iron wire 20# × 300mm ?21 # × 300 ... 500 Galvanized wire 21# × 600 20# 21# 20# × 600 Galvanized Iron Wire