... and Hot-dip Galvanized. Steel Grating Plate Model Desciption:1) Steel Grating Plate Bearing Bar: 20*3mm to ... 100*6mm.2) Steel Grating Plate Bearing Bar Pitch: 12.5mm, 15mm, 30mm ... 30mm, 40mm, 60mm are the common spec..3) Steel Grating Plate Cross Bar Pitch: 38mm, 50mm, 76mm, 100mm ... 100mm are the common spec..4) Steel Grating Plate Materials: Mild Steel or Stainless Steel.5) ...