【Package Contents】2 window restrictors, 2 mounting hooks and 4 screws. Our window latches fit directly into your original door handle and attach directly without additional mounting screws. 【Sturdy and Durable】Window restrictor length 10.5cm, windproof hook. Made of high quality stainless steel with white coating to ensure rust resistance and durability. 【Easy Installation】The window locks are easy to install. Each screw comes with 2 screws. You only need a simple screwdriver to screw it in. Easy to use, no drill required. 【Protection】Also suitable as a cat and child safety lock, safety locking system for turning, tilting and turning windows inward. Safely ventilate the room and let in fresh air. 【Scope of application】The PVC window restrictor for sash or sash windows. Allows you to lock windows at 4 different opening angles and prevent accidental slamming. Compatible with all standard plastic, wood, or plastic windows and doors.