【4-Piece Door and Window Lock Set】This is a sliding patio door safety lock that prevents the window from opening accidentally, providing extra security for your children and your windows.It is recommended to install high and low guards for maximum security and update your home security system.【8 Cosmic Keys】 Equipped with 8 cosmic keys and 4 sliding locks.Each slide lock comes with 2 keys and the keys are universal.【Zinc Alloy】Zinc alloy, anti-rust protection, durable and high quality.【Easy to install】 The padlock is easy to install and use and comes with all security accessories, including stainless steel nuts.【Application】Suitable for most swing or sliding doors, this design is very useful for homes, schools and other children's places.