Marine plywood floor

Weathering steel used for container walls. A thin, stable rust layer on its surface protects the steel from deeper corrosion; good paint is still needed for appearance.

Ribbed steel walls that make a container strong despite thin plates. When cut for doors or windows, openings get a reinforcing steel frame.

Hollow steel blocks at all eight corners of a container: the points for lifting by crane, securing to a trailer and stacking.

A lock inserted into a corner casting and turned, to fix a container to a trailer or to another container when stacked.

Two slots in the base of a container (usually 20ft) for forklift tines, so the unit can be lifted without a crane.

Steel beams running across under the floor that support the floor and the load on it.

Vertical bars on the container doors, turned with a handle to close the doors tightly.