Make of stainless steel, which is corrosion resistant and wear-resistant. Ergonomically and comfortably in the hand. Parent can control the opening and closing authority of window, effectively preventing children from accidentally opening window. Equipped with a lock and a key. The locking of window effectively prevents theft. It can be used in homes, bathrooms, offices, hotel and other place to effectively secure window, balcony door, patios door. They can be quickly installed in just a few simple step and are stable and dependable after installation.