Heavy Duty aluminum extruded legs with patented toe release mechanism offers a wide stance for maximum stability. Screen height is adjustable to accommodate any ceiling height with self-locking extension tube and high-low case adjustment. Exclusive Camlok(R) roller system secures screen fabric in place during usage. Built-in keystone eliminator tilts the screen forward to compensate for distorted images from overhead projectors. Industrial grade carpet around the steel case hides the nicks and scratches that can occur with a portable unit.