... strength, light structure 3.Beautiful appearance, durable 4.factory Walking Steel Grating1)Walking Steel Grating Bearing Bar (Load Bar) Specifications (mm): ... to 100 x 9 or according to customers request. 2)Walking Steel Grating Bearing Bar Pitch (center to center): 12.5 ... 30, 40, 60mm are recommended, America standard is available. 3)Walking Steel Grating Cross Bar Pitch (center to center): from18.5 ...