All containers are equipped with wrought iron corners in each of the eight corners (4 upper and 4 lower).Each of these parts has a groove-shaped openings at both ends and in the upper or lower face. A twistlock (Twist lock), is introduced into the opening through the spreader mobile equipment belonging to a, that rotates 90 º, whereby the twistlock (Twist lock) is fixed to the container and locked, and it is ready for transport. The notches on the sides are for fastening in stowage for shipping.
Many containers box structure, both 20 as 40 feet, are provided with channels through which the forks are inserted, so they can be manipulated by them.
The container standards are established by the International Standards Organization, ISO (International Standards Organization) and some of the measures and weights quoted are the following:
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Sizes
| Name | Total height | Inner height | Total width | Inner width | 40 feet total length | 40 feet inner length | 20 feet total length | 20 feet inner length |
| 8 feet | 2.438 | 2.197 | 2.438 | 2.299 | 12.192 | 11.998 | 6.058 | 5.867 |
| 8,5 feet | 2.591 | 2.350 | 2.438 | 2.299 | 12.192 | 11.998 | 6.058 | 5.867 |
| 9 feet | 2.735 | 2.494 | 2.438 | 2.299 | 12.192 | 11.998 | 6.058 | 5.867 |
| 9,5 feet | 2.918 | 2.677 | 2.438 | 2.299 | 12.192 | 11.998 | 6.058 | 5.867 |
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Maximum weights
However, a container can be loaded up inadvertently 10% more than specified, the charged-center. Thus, a vehicle transporting containers must have an operating capacity of about 75.000 lb (34.000 kgs), with the load center 1.200 mm.as container standards are established by the International Standards Organization, ISO (International Standards Organization)