... round bar grating 1>12 years factory 2>plain grating ,serrated,press lock 3>more kinds are OK 4>Strong structur Specifications of round bar ... long life1.Steel grating standards:A) China: YB/T4001.1-2007B) USA: ANSI/NAAMM (MBG531-88)C) UK ... requirement and 30,40,60mm are recommended4. Cross bar picth:38,50,76,100mm,also be according ... treatment: untreated, painting or hot dip galvanizing. round bar grating