Generally on every intermediate and locking post in sliding grille, there is drop pin (Shoot Bolt) with lock. The drop pin secures the grille with floor so it becomes secure and prevents someone from pushing it open. With a hole in the floor there are chances that it can be filled by dust or someone can get injured by tripping.
GlassEssential has arranged to prevent any such unforeseen events. Our drop pin will be inserted in the dust proof socket. It is loaded with spring and only opens when it is pushed by drop pin. When the drop pin is raised, the dust proof socket closes automatically, thereby providing a secure and clean environment.