... ORSOGRIL equipment .which can arrange the bearing bar and cross bar in longitude and latitude order to certain distance .Cross bar is ... quality gratings with firm welding, smooth surface and high strength.2. Classification: Raised (Standard, Regular) and Flattened3. Pitch of Bearing bar: 30mm, ... bridge, well covers, stairs.5. Ventilation, light leakage, thermolysis, antiskid, explosion-protection.