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Diameter is 6.5mm 8 mm and 9mm.Export packing.The minimum weight of per piece as your choice. Low Carbon Steels, elongation high, the surface is smooth,Rust - resistant, cheap, quality guaranteed.Asopt SAE***6,Production facilities in Hot Rolling Plate Surface treatment, bright Hood - type Annealing Furnace, four sticks reversible cold rolling mill, and a layout of precision flat units, eliminating stress plane pull the master machine, high precision slitting unit.