... 3. Best Price 4. Reliable manufacturer 1. Comprehensive type and broadest range in dimension.1.1 Material Q235 , or other equivalent material1 ... T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5 ... ; b. U type; c. Security type (anti-theft)2.1 Normal type of Drainage/Ditch Cover Embedded installation, safe and ...