<p>ADJUSTABLE SCREW LOCKS, HIGH DURABILITY & STABILITY: This upgraded window double lock is made of solid and reliable aluminum alloy with exquisite workmanship, is more secure, and can serve you for a long time using. You can fix the window in place so can't be pulled or opened, and multiple locks can be applied at the same time to various window or doors to increase safety. You will be so happy these secondary locks can increase your home's safety.QUICK & EASY TO INSTALL, SAVE TIME & EFFORT: No need for extra installation tools or drilling required 3-step quick installation. Just place the lock in a suitable position and tighten the screws! The removable rubber lining can help us have two flexible ways to lock the window or doors. But the rubber lining is useful for reducing window tracks' scratches and damage. 10 sets of safe window locks can reuse, and even women or the elderly can also easily complete this installation process alone.FITS VARIOUS SLIDING WINDOW, EVERY HOME ESSENTIAL: In order to ensure the window lock can be applied to your window perfectly, you can measure your sliding window track before ordering, the height must be greater than 0.39in, and the width to be less than 0.39 in rubber-free (less than 0.24 in contains rubber). Our window locks are suitable for sliding window, sliding glass doors window, retractable screen window, etc. You can install them in a suitable position on most windowUPGRADED WINDOW DOUBLE LOCKS WITH RUBBER BRING MORE SECURITY: This glass sliding window lock with rubber has two fixing holes, which greatly enhance the holding power and security of the lock. Upgraded rubber can protect your window track from damage. Every Family will benefit from the adjustable window lock because window lock can keep the family peace of mind every day and prevents pets from getting lost, prevent thieves and improves indoor ventilation when you travel or go out.SATISFIED SERVICES & PROTECT YOUR FAMILY SAFE: CALDEVER always insists on providing high-quality products and professional after-sales. If you have any questions, we're standing by to assist you all the time for your better purchase experience. Our reliable window lock effectively reduces the risk of children & pets falling from heights, and guards against theft, protects your property against damage during heavy rains and hurricanes, it's also great for people who live alone. You deserved it!</p>