Quick and easy setup – once frames are secured to your opening, tracks are installed using silicone for a smooth, non-abrasive application. Derailing-proof patented Vertical Smart System (US Patent #7,647,729) – always keeps wheels in the tracks and ensures smooth and nearly silent operation. No more problems with panels sliding off the tracks. Uneven floor adaptability – vertical adjustability for up to ¼” to accommodate uneven floors, with a total tolerance of ½”. Sliding Glass Door Complete System includes – aluminum frame glass doors, track options, rolling mechanism, installation hardware, and installation manual. Door stops and panel parks are included as a bonus.