... :20,000tons/year TypeW-- welded steel grating L-- pressure-locked C-- socket-weldingBearing bar centers15-30, 40, 60, 80, 90 mm ... . 3. In the case of stair treads, please specify its type, length, width, quantity and surface treatment. 4. If any enquiries ... , please contact us. industrial floor grating,steel frame lattice,platform floor galvanized steel grating