... grating is made of flat steel according to certain spacing and cross bar (twisted square steel, square steel, round steel, ... flat steel, etc.) to cross arranged, and welded into the middle with ... -proof performance, etc.galvanized steel gratingApplication Specification Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, ...