... to clients requirement and 30,40,60mm are recommended3) Cross bar picth:38,50,76,100mm,also be according to clients ... 7350mm.5) Materials: mild steel or stainless steel.6) Surface treatment: untreated, painting or hot dip galvanizing.7Steel grating with America standard can ... ditch grates,fences,framedgrates,trash rack grates ,paint backing chambers…… Mild steel grating,bar grating,flooring grating