Worried about home security or little ones getting too curious near windows? This 4-pack of PINGXNG window locks is a simple, affordable fix. Made from sturdy aluminum alloy, these little locks are built to last. They're designed specifically for vertical AND horizontal sliding windows and doors. Here's the key thing: before you buy, measure your window track! The track height needs to be more than 0.47 inches (1.2 cm), and the width needs to be less than 0.64 inches (1.62 cm) for these to fit properly. Once installed, they act as an adjustable stop, letting you lock the window in a slightly open position for ventilation while preventing it from being opened further from the outside – great for safety and peace of mind. They come with a small vertical key for easy locking and unlocking. Perfect for bedrooms, offices, balconies, and anywhere you want that extra layer of security. Super easy to install, no drilling needed in most cases. Get that secure feeling without the hassle!