Usage Tips:1.Window opener: this lock is a simple device to install that limits the distance a window can open, Perfect for home and business security. 2.No screws required: this window reducer does not need to use screws for fixing.But you need to clean both sides of your window surface, then peel off the sticker on the back of the window lock and on the windows. 3.Excellent security: this window lock is good for preventing accidents due to open windows, useful to protect your children and avoid burglars and intruders. 4.Multifunction locks: this window reducer for locks can also be used as fridge, cupboard lock, etc.Meets your life needs.Perfect for home, public, hospitals, hotels, schools and commercial applications. 5.Easy to install: when the cable is in place, the opening distance of the window is limited, using the key, the cable can be removed from one end and the window can be opened completely.Fits most types of windows. Integrated stamping to shape the shell to avoid prying or breakage, effectively avoiding being short and easy, tensile resistant, durable and durable; Easy indentation, solid anti-rust, durable and wear-resistant; Installation: paste; Unlocking : key switch Size: 5.65 * 3.85 * 2.4cm Material: Carbon Steel color Black Package contents: 1 * security lock Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.