1、Wide Compatibility: The window lock is suitable for sliding windows, sliding doors and vertical doors. The lock is 2.4inch long and fits tracks up to 0.4inch wide (with rubber cushion) or up to 0.67inch (without rubber cushion). Please measure your track to ensure correct installation. 2、Screw in Design: The sliding window lock is fitted to the sliding window, door track using double screws to prevent sliding and increase security. Simply tighten them with the hex wrench (included) to fully secure the window, door or allow ventilation without additional tools. With a rubber cushion to prevent scratching or damage to the window and increase window security. 3、Sturdy and Durable: Made from reliable aluminium, this window lock will stay strong and sturdy, with a lovely yellow key handle that is eye catching and easy to find. 4、Wide Application: The sliding window lock is perfect for sliding patio doors, sliding glass doors and more. Feel free to leave your windows open a few inches for fresh air and peace of mind, as they no longer open enough for someone to slip into your house without breaking a window and warning your dog. Keep some window latches in your child's room to prevent your child from falling out of the window. 5、Enhances Home Safety: The window lock is an essential tool for enhancing your home's safety, preventing unwanted intruders and securing your property, which is an indispensable tool for anyone looking to improve the security of their home or business.