1. Helical(spiral), Plain, indented 2. 4mm to 9mm 3. ASTM A 416, ... : TT or LC9)Usage: Low relaxation wire used for prestressed steel structure, prestressed and post-tensioning technology in large, medium and ... ), Diameter, Mechanical property(especially tensile strength), coil weight, Packing dimension, Quantity etc.Please contact us for more details. 6mm spiral pc steel wire