... Steel Grate 1> Drainage Steel Grate Characteristics:Trench cover light weight, high bearing capacity, safe , skid-proof, easily fixed and ... Untreatment or Galvanized or Paint spray 5> Drainage Steel Grate Application:Trench cover Widely used in electricity, petrochemical, ... , ventilation and penetration of light, etc6> Drainage Steel Grate Packaging Detail: Trench cover packing by bareness, pallet or ...