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Contact Supplier1.surface treatment: hot dip galvanizing, paint or no coating 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 5.steel standard: (1)china gb700-88 (2)usa: astm (a36) (3)uk: bs4306 (43a) (4)australia: as1657-1985 (5)japan: jjs 6.hot dip galvanizing standard: (1) china gb/t13912-92 (2)usa: astm (a123) (3)uk:bs729