... installation,being economical of materials,being sturdy and dura Steel grating:1) Light weight, great load-bearing capacity, ... factory, transportation, municipal, administration, parking lot etc.3) steel grating may be applied to platform, floor, walkway, stair treads ... ventilates and light through facility, etc.TypeWelded steel grating, pressure-locked, socket-welding Steel flat size20×3,25×3,25×5,30 ...