Features [ADJUSTABLE WINDOW OPENING] Easily restricts and controls the width of the window, regulating ventilation while preventing over-opening. Concealed Design: The restriction lock is installed inside the window frame, providing a concealed and discreet appearance that maintains the aesthetics of the window. Sturdy Solid Column: Features a sturdy solid column for reinforced stability and reliable performance. Sturdy and durable plastic construction: made of high quality PP plastic, with excellent hardness and impact resistance, durable. EASY INSTALLATION: Limit locks include pre-drilled holes and stainless steel screws, simplifying the installation process, quick and hassle-free installation. Product name: door and window lock block limiter Product material: nylon Product Size: 19.7*12*58mm Color: white Packing list (available after purchasing one product): Limiter x12 Please understand: 1.Due to the long shipping time, the item may be damaged during transportation. If the item is damaged, please leave us a message through the official website immediately and then post a comment, I will solve the problem for you. 2. Due to manual measurement, the size may have 1-3cm error. 3. The color may vary from monitor to monitor.