Material: The window security anti-theft lock is made of solid cast zinc structure, with a durable powder-coated surface, wear-resistant, smooth white surface, and can be used for a long time. You will get 4 window locks and matching screws. Security: Installing a sash jammer locks on the window can protect your children and pets, and also prevent thieves from entering your home, making your stay safer and more comfortable. Easy to Install and Use:The sash stopper can be easily installed using the included fixing screws, just follow the installation instructions provided. Just twist the interference arm to lock or release the window sash. Application: These Window Latch are suitable for PVC-u and wood/composite doors and windows. It is also suitable for vertical sliding, single-hung and double-hung vinyl windows. Multiple Functions: you can use vertical sliding sash lock on windows and sliding doors; The window sash lock set can also be given to your friends and family as an indispensable family gift to provide security for their lives, which can easily get their welcome and love, Manufacturer: Sandiyago