Add Security-- window restrictor locks specifically designed for children 's safety. They can limit the distance a window can open so as to prevent children and babies from falling out of windows effectively. Can also discourage intrusions and keep air circulation. Convenient to use--Quick installation and easy use. Our window locks can be locked and unlocked. Flexible use according to your needs. When the cable is in place, there is a limit to how far the window can be opened. Once the cable is removed from one end with a key, the window can be fully opened. Increase extra safety for your home. Premium Material-- window locks are made of high quality material and coated with an MRSA repellent. Durable, sturdy and not easy to rust. It can withstand more pressure and is less prone to damage. Can be used for long time. Wide Application--Safety Locks perfectly suitable for most types of windows and small doors. Widely used for many kinds of materials such as UPVC, wood, aluminum and metal. Ideal safety lock for home, public and commercial occasions. Increase sufficient safety for babies, children, pets, people living alone, etc. What You Get--Package Including 4 pcs window security restrictor, 4 pcs keys and 16 pcs screws. The white look of window lock adds elegant style for your home. And the matching screws make it easy to install, so you can use it right away.