【Package Includes】2 window restrictors, 2 mounting hooks, 4 screws. Our window restrictors can be inserted directly into your existing door handle and can be fixed directly without additional mounting screws. 【Sturdy and Durable】Window restrictor length 10.5 cm, windproof hook. Made of high-quality stainless steel with a white coating to ensure it is rustproof and durable. 【Easy Installation】The window restrictors are easy to install. Each restrictor comes with 2 screws; you only need a simple screwdriver to screw them in. Easy to use, no drilling required. 【Protection】Also suitable as a cat and child safety lock, a safety locking system for tilting and turning inward-opening windows. Ventilate the room safely and bring in fresh air. 【Scope of application】The PVC window restrictor for sash or tilt-and-turn windows. Allows you to lock open windows at 4 different opening angles and prevents accidental slamming. Suitable for all common plastic, wood, or other types of windows and doors.