... OK 4>Strong structur Specifications of 30x3 galvanized steel grating paint steel grating12 years factoryplain grating ,serrated, press lockExport: Us,Eu,Uk,AuStrong structure ... : AS1657-1985E) Japan: JJS.2. Bearing bar specification:20*3 to 100*63. Bearing bar pitch:12.5,15,25,30,40 ... to clients requirement and 30,40,60mm are recommended4. Cross bar picth:38,50,76,100mm,also be according to clients ...