Product Material Made of high quality material, can withstand higher pressure, not easy to damage. Excellent safety High quality choke cable for increased safety, health and home safety and baby / child safety. Easy to install Made of steel wire measuring 19cm long, comes with self-tapping screws and wrenches, just a screwdriver or drill to install. Very useful Ideal for PVC, aluminium, wood, composite doors and windows. Use on double-hung, slatted and sliding windows; balcony doors, guest room doors, etc Locked and unlocked Special limited design provides 19cm of restriction and fresh air, and the window can be fully opened when the cable is pulled out at one end with the wrench. When the cable is in place, the distance that the window can be limited. With 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 18.5cm. Unique lock core, greatly increased the security of the door lock. The packaging among: 4pack < /div>