... with the People's Republic of China steel standard production standards YB-T4001-1998 Steel Grating Standardizations ... , 65x5, 75x6, 75x10---100x10mm etcI bar: 25x5x3, 30x5x3, 32x5x3, 40x5x3 etcUS standard: 1''x3/16'', 1 1/4 ... 38.1, 40, 41.25, 60, 80mm etcUS standard: 19-w-4, 15-w-4, 11-w-4 ... 6Grating StylePlain / Smooth, Serrated /teeth, I bar, serrated I bar 7StandardChina: YB/T 4001.1-2007, USA: ...