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1.Ductile iron casting manhole cover 2.Process :casting 3.ISO 9001 Certificate 4.Good quality and competitive prices 5.O2)Manufacture:casting.3)The manhole cover can be made in different standards of iron,with grey and ductile casting iron4)We can guarantee the quality use for long time.5)Our technical engineer design the product for high accuracy.6)Your supplied drawing is welcomed. We're a leading manufacturer specailized in making casting manhole cover,which have been sold well around the word.In South Korea,our products take the most majority,and they have a good and stable quality. If you are interest in our products,pls feel free to contact me.