Sliding Track Lock: Secure your patio door, sliding glass door, and both horizontal Vertical sliding windows. Ideal for securing a vertical window air conditioner or window fan setup. Durable Sensible: Made of heavy-duty aluminum the lock includes a vinyl lining to prevent you from scratching your window frame. The vinyl insert provides additional gripping power when locking your windows down. No Tools Needed: These window locks are easy to install with the lock thumb screw securing sliding door window tracks up to 7/32" wide. Child Proof Door Locks: Use this window lock to protect your family from intruders and more! The sliding door lock allows you to leave sliding windows doors securely locked in position, whether fully closed or ajar to allow a breeze. Window Locks Security: Whether you are looking for a way to lock in an AC unit window setup, as a camper lock replacement, or as part of your baby proofing house setup.