Steel grating: 1.Bearing bar pitch:30,40,60mm 2.Cross ... fiber steel etc..Surface treatment: hot-dipped galvanized,elctro-galvanized, painting,etc..Features: Ventilated ,slippery-preventing,strength-bearing, heat dissipation , explosion- ... proof , beautiful and durable, easy to clean, convenient installation.Grating Dimension Load Bearing Flat Bar ...