This product is a kind of hinged opening side scuttle. It is made of aluminum, steel, stainless steel and copper. This marine hinged side scuttle is used for sea-going ship and warships, and also could used for inland ship. It is approved by GB/T 14413-93 standard. Certificates about this hinged side porthole are CCS, BV, DNV, LR, KR, NK, etc. We can supply four types of this hinged side scuttle: type A-SB, type A-SW, type B-SB, and type B-SW.