welcome to our shop! Material Made of high-quality materials, it can withstand higher pressure and is not easily damaged. Superior Safety High-quality choke cables improve home safety, health and safety, and baby/child safety. Easy to install Made from 19cm long steel wire, comes with self-tapping screws and wrench, requires only a screwdriver or drill to install. Widely suitable for PVC, aluminum, wood, composite doors and windows. Used for double-hung windows, casement windows and sliding windows; balcony doors, guest room doors, etc. Locking and Unlocking Special limit design, providing 19 cm limit and fresh air. Pull out one end of the cable with a wrench to fully open the window. Once the cables are in place, there are limits to how far the windows can open. Using a wrench, you can remove the cable from one end and open the window completely. It has a novel shape, smooth lines, can be bent at will, and the line distance can reach 18.5 cm. The unique lock core greatly increases the security of the door lock. packing list: 4 pieces 1. Due to different screen and lighting effects, the actual color of the item may be slightly different from the color shown in the picture. 2. Please allow 0.1cm/0.039in-0.3cm/0.118in measurement deviation due to manual measurement. (Customer satisfaction is our top priority. If you find any product problems after receiving the goods, such as damage or incorrect quantity, immediately. We will try our best to provide you with satisfactory after-sales service. Thank you for getting to know me. I hope this helps you. wish you a happy life. Have a great time shopping!