Serrated steel grating: serrated steel grating from one side is serrated flat welded together, in addition to ordinary steel grating characteristics and uses also has a strong anti-slip capability, especially for wet, slippery places, sea oil platforms. Serrated steel grating hot-dip galvanized surface treatment, has a strong anti-rust force. This product can be used as a drain cover and frame hinge connection, security, safety, easy to open. Serrated steel grating made of high strength steel, the steel grating with high strength: the strength and toughness is much higher than cast iron, can be used for docks, airports and other large span and heavy load conditions. This product has a large mesh with the best drainage: leakage area of ??83.3%, more than twice the iron. Product appearance: simple lines, silver exterior, modern ideas, saving investment material Province: large span, heavy load, low prices than cast iron; and save iron Gein stolen or crushed and replacement costs.