... load-bearing capacity,non-slip and safe, 2 easy installation,sturdy and durable, ventilated Steel Grating /Steel ... , building, paper mills, cement plant, medicine, spinning and weaving, foodstuff factory, transportation, municipal, administration, parking ... stair treads, trestle, fencing, drainage, trench cover, pit cover, suspended ceiling, ventilates and light through facility, etc.4) category: 1 ...