We can see the existence of retractable posts in various streets, residential houses, museums, and even different beautification safety protection projects in the city. With the progress of the times, polished retractable posts have penetrated into more environments, and this craft is constantly being updated. In what environment should crowd prevent retractable posts be used? How to use it properly? If you want to use it to add security and beauty to your life, you might as well read this article.