... as the residence outside the window, the balcony guardrail, highway, railway guardrail etc.Steel Grating Standardizations: CountriesNational Standards for ... etc; I bar: 25x5x3, 30x5x3, 32x5x3, 40x5x3 etcUS standard: 1''x3/16'', 1 1/4''x3/16'', 1 ... 35, 38.1, 40, 41.25, 60, 80mm etcUS standard: 19-w-4, 15-w-4, 11-w-4, ... Japan:JIS Galvanized and Painted Steel Grating with standard size