... grating and good price .Grating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, 30.16, 32.5 ... ApplicationPlatforms ,sidwalks,filter grates,ventilation grates,driling stages, ladder steps,ditch grates,fences,framedgrates,trash rack grates ,paint ... backing chambers……Bearing bar pitch from 12.5mm to 100mm of which 30mm and 40mm are ... 50mm and 100mm are recomended . price aluminum step ladders