High-quality materials: The door and window stoppers are made of high-quality materials, which are durable and wear-resistant, not easy to break, and can be used for a long time. * STAY SAFE: Window children locks can limit how far doors and window can be opened to help reduce the risks of injuries from falls while allowing freshs airs to circulate. *Adjustable design: The window safety lock has 5 slots, you can adjust the size of the window hole according to your needs. *Easy to install: The children safety lock is easy to install, strong and sturdy, effectively preventings children from accidentally opening doors, window and cabinets. *Multiple scene applications: Children safety window limiters are widely used in various casement doors and window, which can be used for both inward opening and outward opening, such as metal, wood, casement window and sliding window. Description: Material: Plastic Steel Size: As Shown Application: Various casement doors and window, both inward and outward opening can be used. Package List: 1 x Window Securitys Lock