Premium and Safe Material: Child safety window locks are made of low carbon steel material, which is more safer and more flexible. Casement locks can withstand greater pressure, are not easy to get damaged or rust. Baby Safety Window Lock: When the Window Restrictor is in place, the distance that the windows can be opened is limited, which is very suitable for families with children. Children will not be able to reach dangerous places and avoid being injured by accidents. Prevent Injury and Secure Safety: Our safety restrictor lock can effectively prevent children from falling from window, restrict the entry and exit of children or pets. This door restrictors for upvc items can also prevent theft. One lock has multiple uses. Easy for Installation: Our Window Latches are a great addition to your home safety checklist and are easy to install with the included installation template and screws(Install instruction see the picture attached). Baby Security Lock can make the family safer and parents more worry-free. Chain Lock made of high quality steel, strong and durable, not easy to break, strong load-bearing capacity, smooth surface to prevent rust, corrosion and wear resistance.