The CAL Double-Bolt primary function is to protect your home or property from intruders. The CAL Double-Bolt Lock has been tested to provide over 1000 lbs. of Forced Entry Load Tension, preventing criminals from being able to lift out the sliding glass door from their tracks. This type of high security is something factory installed locks or after-market products cannot offer.The CAL Double-Bolt Lock sleek, aesthetic, and low-profile design helps fit easily within the limited space available between the sliding glass door frame and the interior of the door panel. Allowing the lock to virtually disappear within the frame and window environment. IMPORTANT to note also this Double lock is the most secure and easiest way to prevent your children or grandchildren from wandering outside the house. Its innovative system allows you to install the lock at the desired height preventing children from reaching the lock and escaping into potential danger. Due to its unique design and operation, any occupant within plain view of the Double-Bolt Lock could easily determine whether the lock is Open or Secured. The Double- Bolt lock is great for everyone who owns a home. Kit includes all required Lock components including various configured bolt receivers, and mounting Screws. Replaces Sliding Door Security Bar – Adjustable & Fits Most Doors.