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The production is : 1.Excellent electrical insulation resistance ,arc resistance and signs of leakage. 2.Excellent mechanical strength ,flame resistance and heat resistance. 3.Non-recycle value for anti-theft. 4.Anti acid ,alkali and chemeical corrosion,impact resistance ,anti-rust,water-ability,durable (30 50 years),locking option.When damaged,no holistic hole,avoids sudden accident.Use the superfine calbonate ,good density. 5.Only 1/3 weight of the cast iron one ,and 1/2 of the BMC with steel one. 6.Convenient transportation and installation reduce work intensity. 7.Physical appearance is beautiful,smooth,no distort ,easy to open.Unique multi-directional stop resisttant tread pattern. 8.Noise is very low and rebounding free when car roll on. 9.With perfect decoration effect and the color will be the right Applications: (1)Electric power pipeling well;post,telecommunication,communication pipeline well; (2) Street lamp well,fire control well,all kinds of valve well; (3)City water,drainage pipeline well;heat supplied,gas well; (4)As cover board for anti-corrosion project