... :6mm 4.Distance of bar:30-100mm 5.ISO9001-2000 1.Steel Grating is the most popular of all grating types ... industrial platform, ladders, helps column, channel pedal, railway, high CeDao floor drain cap, platform scale, covers the grille, stereo, road parking lot ... you to choose 2)HOT!hot dip galvanized steel grating/floor grating/steel bar grating (10 years manufacturer)