✅ Durable Construction – Unlike window locks sold at home centers that easily break, this one is made of sturdy and durable aluminum. The interior is coated with vinyl and additional patches to prevent scratches on the window frame rails, further enhancing window security. ✅ Keep Your Home Safe - Leaving your window keys unlocked can allow intruders to enter and exit freely. That's why we offer the ideal window stopper set suitable for various applications, such as vertical and horizontal windows and sliding doors. ✅ Window Lock Security - If you're looking for a home security window lock for sliding doors that can securely close sliding doors and windows, this is the one for you. Featuring a thick design, it can block more strongly than other window lock security stoppers, providing even more peace of mind for your home's safety. ✅ Innovative Design - Designed with two screws that can be turned by hand, eliminating the need to bring tools and allowing for quick and easy tightening or loosening as needed, making it ideal for securely fixing the locking parts and making installation and removal easy. ✅ Easy Installation - Improves window strength in about a minute without the need for tools. It can be clamped to prevent the window from opening, and you can fully close the window or allow a little air in for ventilation while locking it. Window Lock Child - Window Anti-Fall Prevention Window Stopper Window Key Sliding Door Key Window Open Slightly Lock Sash Lock - 4-piece set of door locks for home improvement and protection * Brand new, unused * Immediate purchase welcome, no-comment purchase OK * First-come, first-served for only one item * Bulk purchase welcome, feel free to comment * We will prioritize those who purchase even during comment exchanges, so please understand. * We will prioritize those who purchase even if it is marked as "reserved," so please understand. * We may change from Yu-Yu Mercari to Raku-Raku Mercari. We have various other items on sale too ♥ #ytha's SHOP $$780