... years old, professional and reliable2).Material: steel Q235, hotstrip by cold rolled3).Outer tube : ¢76mm, ¢70mm,¢60mm, ¢56mm, ¢48mm4).Inner tube ... ,4.0mm6).Top/Bottom plate: Flat Square / flower plate, U-head7).Anti-rust coating: Powder coated, cold galvanized8).Loading capacity tested, manufactured ...