XIANQI Versatile. Our adjustable security locks are suitable for horizontal and vertical windows and sliding glass doors Easy to install. First, place the sliding locks on the window track. Second, tighten the washers with the hex key so that the sliding window locks will be secured to the window frame. You can use the hex key to adjust the tightness. Practical accessories. We offer plastic protective washers, they stop the window from being scratched and damaged. Provides friction for securing sliding locks. Wide range of applications. Our sliding window locks are suitable for most windows and are widely used in homes, elementary school and kindergartens. It can keep the window partially open or closed to prevent safety hazards. Color: Silver Size: 6*2.5cm Product list: 4*window lock restrictor