1. opener: this lock is a simple device to install that limits the distance a can open, Perfect and business security. 2.No screws required: this reducer does not need to use screws for fixing. you need to clean both sides of your surface, then off the sticker on the back of the lock and on the windows. 3. security: this lock is good for preventing accidents due to open windows, useful to your children and avoid burglars and intruders. 4.Multifunction locks: this reducer for locks can also be used as fridge, cupboard lock, etc.Meets your life needs.Perfect , public, hospitals, hotels, schools and commercial applications. 5.Easy to install: when the cable is in place, the opening distance of the is limited, using the key, the cable can be removed from one end and the can be opened completely.Fits 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 are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.