It is also be called as porthole, the material can be aluminum,
copper or steel, is used for sea-going ships and warships, also can
be used for inland ship.
The side scuttle can be with or without deadlight, the deadlight
also be called as storm cover.
The side scuttle can be manufacted by aluminum, steel & brass.
Material code number
1. if the steel(2) main frame, copper(1) glass holder, steel(2)
deadlight, the material code number is 212.
2. If aluminum(3) frame, aluminum(3) glass holder, without
deadlight(0), the material code number is 330.