Compatibility: Window locks are applicable for sliding windows, sliding doors and vertical doors. Please measure your window track for compatibility with the locks before buying, With a track size height requirement of greater than 0.48 inch (1.2 cm) and width limitation of less than 0.61 inch (1.55 cm). Depending on the type of track, window locks can be installed on either the inside track or the center track.,Best Window Safety Protector: Double Lock protection design adds security on heavy windows/doors. Great for baby/toddler proofing to keep them from opening the windows, climbing out and falling out of windows! Great Extra Protection From Break-ins. This window Lock keeps your home safe when leaving home for work or travel.,Enjoy the fresh air: leave the window slightly open to get some fresh air without opening the window. You can sleep with your window open a little at night but not worry that someone can open it further.,Easy to install. The window locks are very easy to install just place them on the window sliding grid and then screw them on with the given lock. Thickened aluminum alloy material, not easy to corrode, not easy to rust, very durable. Plastic strip included. That will prevent you from making marks on your window trim under the screws.,PACKAGE INCLUDES: 6 security window locks, 6 mounting hex keys, 6 protective gaskets, 1 vertical key for mounting to center track.