This locking mechanism is made of durable metal and is approximately 4cm high. By adding an auxiliary lock, you can securely fix the window. You can significantly increase security with simple measures. Installing two, one at the top and one at the bottom, will further enhance security, reducing anxiety about intruders entering through the window while you sleep, allowing you to sleep soundly at night. This window lock can be easily installed by simply inserting it into the sash groove and rotating the knob, without using screws or tools. It's a window stopper that anyone can install quickly, and can be easily installed on windows, etc. - Color: Black - Type: Locking mechanism - Material: Plastic - Size: Approximately 5 cm in height Thank you for viewing.