... we are manufacturer Top quality, cheapest price,best service various size ,usualy3-12mm Surface: indented, plain, helical Supplier China ... )Type of Surface: Helix(screw), Plain, indented. 4)Standard: GB/ T 5223-2002, ASTM A416, BS5896, JISG3536, ISO9001-2000 ... , highway, etc. 8)when you Inquiry please provide: Standard(year), Diameter, Mechanical property(especially tensile strength), coil weight ...