Steel grating type: welded steel grating and press bar grating. Bearing bar type: flat bar and I bar. Bearing bar pitch: 20 mm, 30 mm or 40 mm. Cross bar pitch: 50 mm or 100 mm. Nosing type: checker plate, strip plate and hole plate. Surface treatment: galvanized or anti-corrosion painted. Bearing load: 1.5 kN.