Semi-automatic twistlock is a special twistlock for shipping containers. Twistlock are the most common method of securing containers to ship decks, container ships, semi-trailer trucks, floors, and to other containers. Semi-automatic twistlock is special as it has an automatic locking mechanism, that activates when placing a shipping container on top of it. Semi-automatic twistlocks are ideal when containers are to be connected and when you can not easily open twistlocks containers from the ground. This twistlock still has to be opened again manually, when lifting the container off the twistlock. Read more about twistlocks on Wikipedia: https://en.wikipedia.org/wiki/Twistlock
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