Measure Your Track: The window lock is suitable for sliding, sliding doors and vertical. Before ordering the window lock, please measure your window track size, the height mt should be greater than 0.48 inches (1.22 cm), and the width mt should be less than 0.61 inches (1.55 cm). The window lock is equipped with a vertical key, which can be applied to the middle track of the window. Upgraded Design: 2024 upgraded design, each of our window locks has two fixing holes to fix it on the window track, which greatly enhances the holding power of the lock, and the double hole heavy duty/door increases security. The window lock is also equipped with a pad to prevent scratches or damage to the window and improve stability. Wide: It can ensure the safety of your family, can control the window to be partially opened or closed, effectively reduce the risk of children falling from a height, and by locking your windows, it can also protect your property from damage in heavy rain. In addition, it can also prevent thieves and thieves. This sliding window lock is suitable for home, bedroom, kindergarten, office, etc. Easy to Install: No additional installation tools or drilling are required, 3 steps to install quickly. Step 1, place the lock in a suitable position. Step 2, insert the washer to protect the window track from scratches. Step 3, tighten the screws, done! You can easily fix the window lock at any part with a vertical wrench or hex wrench, easy to remove and reinstall. Package Included: 2 sets of sliding window locks. Thank you very much for your choice, we care about our customers' purchase satisfaction.