Prime-Line D 1579-1 Sliding Door Repair Track &ndash; Repair Worn or Damaged Sliding Glass Door Aluminum Tracks and Horizontal Sliding Window Tracks, 1/4&rdquo; x 8&rsquo;, Stainless Steel TRACK COVER  This stainless steel patio door track cover can be used to repair worn or damaged sliding glass door aluminum tracks, making it easier to open your door. VERSATILE  The sliding door track cover can also be used as a repair part on horizontal sliding window tracks. EASY INSTALLATION  Installation is quick and easy  the repair track simply snaps over the old track and is attached with silicone adhesive (not included). CUT TO FIT  This patio door track cover measures 8 feet long, but can be cut to any length to fit your door or window. NOTE: Authentic Prime-Line D 1579-1 will only arrive in a protective cardboard tube. If you receive a lose piece in a regular box, the item is likely counterfeit and you should report it directly to Prime-Line.