... Drainage Steel Grate 1> Drainage Steel Grate Characteristics:Trench cover light weight, high bearing capacity, safe , skid-proof, ... textile, well cover, suspended ceiling, ventilation and penetration of light, etc6> Drainage Steel Grate Packaging Detail: Trench cover packing ... smooth4.Dimensions of area5.Span(direction of bearing bars)6.Finish: paint spray,hot dip galvanized,untreatment About Us ...