Adjustable bar that easily slides from 25 3/4-inches to 47 1/2-inches for easy installation without cutting and allows door to be left partially open while still being secured. Install on either the inside or outside track (see instructions for more details). Unlike pressure-mounted bars that can shake loose and fall, the SK110 patio door security bar and saddle are screwed into the door frame and profile, providing reliable protection. Mounts in the middle of the door, not on the bottom allowing you to open your door without bending down to reach the bar