1、Wide Compatibility: The window lock is suitable for sliding window, sliding door, and vertical door. The lock is 1.18in long and suitable for rails up to 0.4in with rubber cushioning or up to 0.67in without rubber cushioning. Please measure your track to ensure proper installation. 2、Screwing in Design: The sliding window lock is installed on the sliding window and door rail using double screws to prevent sliding and increase safety. Simply tighten them with a hex wrench to fully secure the window and door or allow ventilation without the need for additional tools. 3、The Aluminum Alloy: Having been through exquisite workmanship, the sturdy aluminum alloy material is very durable for long term using, while the yellow handle is very conspicuous. 4、Better Application: Sliding window locks are very suitable for sliding courtyard doors, sliding glass doors, etc. Open the window a few inches at will for air and peace of mind, as they are no longer open enough to allow people to slip into your house without breaking the windows. Place some window locks in your child's room to prevent them from falling out of the window. 5、Easy Installation: 4 piece sliding window lock with rubber pad and key. Applying multiple window locks can increase the safety of sliding door for window.