Material Made of high-quality material, can withstand higher pressure, not easy to damage. Excellent safety High-quality gas cable for increased safety, health and safety in the home and baby/child safety. Easy to install Made of steel wire measuring 19 cm long, comes with self-drilling screws and wrenches, just a screwdriver or drill to install. Wide range of applications Perfect for PVC, aluminum, wood, composite doors and windows. Used on double-hung, casement and sliding windows; balcony doors, guest room doors etc. Locked and unlocked Special restrictor design provides 19 cm restriction and fresh air, and the window can be fully opened when the cable is pulled out at one end using the wrench. When the cable is in place, the distance the window can be opened is limited. Using the wrench, you can remove the cable from one end and open the window completely. New shape, smooth line, can be bent at will, cable distance up to 18.5 cm. Unique lock core, greatly increased the security of the door lock. Package includes: 4 pcs