1, Anti-slip 2, Anti-rust 3, Full range in bearing bar size and mesh size ... iron products. Hot-dip galvanized treatment: Good rust-proof property, maintenance-free replacement. Anti-theft design: The cover and the frame is ... carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating6Grating StylePlain / Smooth, Serrated /teeth, I bar, serrated I bar7StandardChina ...