... 1. Full range in bearing bar size and mesh size 2. Largest production capability 3. Best Price 4. Reliable ... dimension.1.1 Material Q235 , or other equivalent material1.2 Grating Conformity Standard: YB/T4001, ANSI/NAAMM-MBG531, BS4592 ... flat bars(mm)12.5,15, 20, 30, 30.6, 32.5, 34, 34.8, 35.3, 40, 60, ... and reliable, anti-thrust (not easy to shed)2.2 U type of Drainage/Ditch Cover Both ends welded ...