This stainless steel window stopper limits or releases the window opening, providing a reliable balance of ventilation and security. Its removable design adds flexibility for different needs. Benefits - Allows fresh air and natural light while maintaining safety in the room - Compact, sturdy stainless steel construction for durable, long‑lasting use - Easy installation and compatibility with a variety of window types Key attributes - Material: stainless steel - Function: limits or releases window openings - Design: removable for flexible use - Size and compatibility: suitable for different window configurations; choose model based on slot width - Performance: steady, secure operation for daily use Applications - Bedroom window: ventilate safely without leaving the window fully open - Living room or home office: enjoy airflow and light while maintaining passive security - Rental or multi‑window homes: straightforward install and adaptable to different frame styles Installation guidance - Install at least 9 cm from the frame, as shown in the image - Slot width guidance: if the slot width is greater than 13 mm, choose model S. If it is less than 15.5 mm, choose model L.