Mobile Adjustable Height Clear Lead Acrylic Barrier The Adjustable Height Barrier allows the user to position the clear pb at any level between 45 1/2" and 68" . By use of an internal counter balancing mechanism, the clear pb can be moved up or down with minimum effort. The overall width of the base is 31 " and provides 1mm pb equivalent protection. The upper 28" wide clear pb provides .5mm lead equivalent protection. This strong yet lightweight barrier is convenient to use for dozens of applications. The 7" legs and casters facilitate easy transport ensuring you will get maximum usage fromit. When completely closed the barrier is easy to store.