2.Surface Shape: Planform, tooth shape and I shape(According to requirement made different protective treatment).
3.Classification:Welded steel grating, standard pressure lock grating, dense grating, ditch cover and ladders
4.Quality Standard:
(1)Steel Grating Standard: China YB/T4001-1998
(2)America ANSI/NAAMM (MBG531-88)
(3)Britain BS4592-1987
(4)Australia AS1657-1992