Rectangular(RHS) and Square(SHS) Hollow Section Conforming to IS 3589 / API 5L Grade A/B/IS 1979 Conforming to IS 3589/API 5L Grade A/B/IS- 1979 Conforming to BS - 3059 / ASTM - A-53 Conforming to IS - 1239/1161 / IS 10577 / IS 3601 Conforming to ASTM-A-106, GR B / A53 GR B / API 5L GR B
