Commonly these expandable barriers are used as internal medium security with an appealing diamond lattice aesthetic. They are constructed of 12.7x12.7x0.9mm tubular white epoxy coated cold rolled steel lattice set into a 38mm steel 'U' channels but use of pivot points. They bunch up to approximately 15% of their overall width.
 Trackless Barrier System
Spanning any width it can be temporarily fixed in place with shoot bolts locking each trolley into the floor, for optimum security. Locking devices on the end posts allow them to be effectively secured to the walls.
There are two types of trolleys, Type B with a shoot bolt and Type D which is required where 2 barriers meet at 90 degrees to each other.
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