【High quality】Made of UPVC, wood, aluminum and metal, it is not easy to deform and has a long service life. 【With Keys】When the cable is in place, the distance the window can be opened is limited. The cable can be removed from one end with the key and the window can be fully opened, which is simple and convenient. 【Easy to Install】Provide self-drilling screws, easy to install, only need screwdriver or drill bit for installation. 【Protect Security】Limit the distance between windows to protect child safety when there are children in the house. 【Wide Application】Suitable for most types of windows and doors, ideal for domestic, public and commercial applications.