steel grating 1.material:steel,galvanized steel 2.bearing bar thickness:3mm or 5mm 3.Pitch of Bearing bar:30mm,40mm,60 ... serrated grating, trench grate, stair treadGrating Surface:Hot dip Galvanized, PaintingGrating Specification:19-w-4, 15-w-2, 30/100, 40/50 ... and walkway, trench cover, stair tread contact personMichelle Gao electro and hot-dipped Galvanized steel grating for furance platform