Serrated grating as known as serrated bar grating or serrated steel grating, is welded by serrated flat steel, which has strong anti-skid ability, especially suitable for wet and slippery places, offshore oil production platforms, etc. The serrated steel grating adopts hot-dip galvanized surface treatment, which has strong anti-rust performance, and is maintenance-free and replacement-free for 30 years. The ditch cover and frame of serrated gratings can be connected with a hinge, which is anti-theft, safe and easy to open.