Materials Made of high quality material, can withstand higher pressure, not easy to damage.\n\nExcellent safety High quality choke cable for increased safety, health and home security and baby / child safety.\n\nEasy to install Made of steel wire that measures 19cm long, comes with self-tapping screws and wrenches, just a screwdriver or drill to install.\n\nWidely used Ideal for PVC, aluminium, wood, composite doors and windows. Use on double-hung, slatted and sliding windows; balcony doors, guest room doors, etc.\n\nLocked and unlocked Special restricting 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.\n\nWhen the cable is in place, the distance that the window can open limited. With the wrench, you can remove the cable from one end and open the window completely.\n\nNew shape, smooth line, can be bent at will, cable distance up to 18.5cm.\n\nUnique lock core, greatly increased the security of the door lock.\n \nThe package contains:\n\n4pack