... ,ladders,floor drain,floor drain ISO9001 Serrated Steel Welded Grating Material:steel grating is made of low carbon steel ... should be untreated,painted or hot dipped Galvanzied Specification:steel grating No.ItemDescription1Bearing Bar25x3, 25x4, 25x4.5, 25x5, 30x3 ... painted, spray coating 6Grating StylePlain / Smooth, Serrated /teeth, I bar, serrated I bar 7StandardUSA: ANSI/NAAMM(MBG531-88),UK: ...