... is professional manufacture for ductile iron manhole cover, pls contact with us if you have inquiry. (1) Material a) Ductile iron GGG500b) Grey iron GG20(2) Designs ... a) EN124 Class B125 C250 D400 ,with different size and grammage, or as ... Packing: Steel or wood pallet, or as per customers' requirement ductile iron casting manhole cover