1.Galvanized steel grid 2.ISO 9001:2000 3.ASTM A123,SS400 4.Common ... /8'', 1 1/2''x1/8'' etc2Bearing Bar Pitch12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 32 ... , 80mm etcUS standard: 19-w-4, 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc. 3Twisted Cross Bar ... ),UK: BS4592-1987, Australia: AS1657-1985, Japan:JIS China: YB/T 4001.1-2007,