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The main uses are mainly for municipal roads, water supply, power supply, posts and telecommunications, street lamps, residential quarters, garden planning, oil and gas exploitation, chemical production, sewer cover, sanitation and other engineering projects. 1. Heavy Duty: road or parking space for motor vehicles. 2, light: green space, passageway, bicycle lane or sidewalk which are prohibited by motor vehicles. 3. Common type: road or parking space for vehicle 10 and below. Well cover: it consists of a well frame and a well cover. The manhole cover is designed into a square groove, the section covers, can also be combined with obtrapezoid, so that the manhole cover and the manhole frame more closely, to improve the current shortage of manhole cover, manhole cover only in contact exposed on the surface of a frame, a certain depth of the middle concave manhole cover, the bottom of the concave arc. The new type of stealth cover is a steel plate, and the surface is directly attached to the floor tiles. Material: 201304 galvanized steel plate