Measure your window track before purchase: Our window locks are designed compatible with various vertical and horizontal sliding doors and windows. Please measure your window track before purchase to check compatibility with the lock. The lock works with track size height 0.48 inches (1.2 centimeters) and width less than 0.59 inches (1.5 centimeters). Design: 1. Window lock and key separation design to prevent children or thieves from unlocking at will 2. Thickened aluminum alloy material, without deformation 3. The window lock is designed with two fixed holes for locking 4. Lock main body design, the blocking area when opening the window becomes more solid 5. The window lock is equipped with protective washers to prevent scratching or damage to the window Multi functional availability: Our sliding window locks are widely used in various situations, including houses, apartments, hotels, offices, and more. Window locks can freely control sliding windows to partially open or fully close, preventing accidents for children or pets, and preventing theft. Installation without drilling: Installation does not require other tools or drilling. Place the lock in place, insert the protective gasket, and tighten the screws to secure it. The software package includes: 4 security window locks, 4 installation hexagonal keys, 4 protective pads, and 1 vertical key for installation to the center track Colour: black Material: Metal Package Contents: 4 x security window locks 4 x installation hexagonal keys 4 x protective pads 1 x vertical key