manufacture 4mm-9mm, helical,/screw/spiral usually 4 ribs ASTMA,BS JIS ... pc wire, smooth pc wire, spiral pc wire, helical ribs pc wireProduce various Pc strand Produce prestressed concrete ... pc wire, Smooth pc wire,spiral pc wire,helical ribs pc wire.Produce various Pc strandProduce prestressed concretePC ... 8mm, 9mm,10mm etc.,3)Type of Surface: Helix(screw), Plain, indented. 4)Standard: GB/ T 5223-2002, ...