... ,I-shape 4>galvanized tree steel grid Features: High strength and light structure The reliable grid welding enables high load bearing The ... ,A1011,A569,Q235,2755Surface treatmentBlack, hot dipped galvanising, paint6StandardChina: YB/T 4001.1-2007USA: ANSI/NAAMM(MBG531-88)UK: BS4592-1987Australia ...