... ISO9001-2008 & Steel Grati iron floor grating steel ladder galvanized steel floor gratings serrated bar grating ISO STEEL ... 8'', 1 1/2''x1/8'' etc2Bearing Bar Pitch12.5, 15, 20, 23.85, 25, 30, 30.16, 30 ... etcUS standard: 19-w-4, 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc. 3Twisted Cross ... Japan:JIS galvanized iron floor grating,galvanized steel ladder.serrated bar grating,galv serrated grating,anti slp grating