Steel Grating Bearing bar:30,40,60mm Cross bar:50,100mm Plain,Serrated,I-shape Hot-dipped galv,Painted Steel Grating1>Bearing bar ... ,of which 50mm,76mm and 100mm are recommended. 3) Steel grating is made by the world first-class equipment,which can ... , 30.3, 34.3, 35, 40,41,60mm. US standard: 1"x3/16", 1 1/4"x3/16", 1 1 ... /NAAMM(MBG531-88)UK: BS4592-1987Australia: AS1657-1985 (Manufacturer) Steel Grating