Window lock security Please double check that the size is up to your requirements. For rails over 0.6" high and less than 0.62" thick. Upgraded Protection Design This window lock is made of sturdy aluminum alloy, which is anti-rust and anti-aging. The upgraded vertical window lock design allows the key to be taken out and stored properly to prevent children from accidentally opening the door. An extra layer of protection to eliminate all potential hidden dangers. Easy to install This adjustable home lock is suitable for windows and sliding doors. No-hole installation saves time and effort. All you need to do is pass the key through the hole and attach the window block to the track. You can easily secure the window lock anywhere with the vertical key. No additional installation tools are required. Easy to reuse and reinstall. What you get 4 sets of sliding window locks, including 4 sliding window lock plugs, 4 keys, can fully meet the needs of large families and large houses. Note: Heavy duty doors and windows should be secured with multiple locks at the same time for greater stability and security. We check the integrity of the product before shipping, there may be some minor scratches due to shipping.