Steel grating: 1.Bearing bar pitch:30,40,60mm 2.Cross bar pitch;50,100mm 3. ... galvanized,elctro-galvanized, painting,etc..Features: Ventilated ,slippery-preventing,strength-bearing, heat dissipation , explosion-proof , beautiful and durable, easy to clean, convenient installation.Grating ... .6, 102……Grating type: flat bar: plain type, plain I type, serrated type, serrated I type; cross bar: round type ...