... , 2 easy installation,sturdy and durable, ventilated Steel Grating /Steel grid 1) Light weight, great load-bearing ... , transportation, municipal, administration, parking lot etc.3) steel grating may be applied to platform, floor, walkway, stair ... common steel flat grates,2.I shape steel flat grates, 3. serrated steel flat gratingTypeWelded steel grating, pressure-locked, socket-welding Steel flat ...