TOOL-FREE, EASY AND CONVENIENT INSTALLATION: This window restrictor model does not require drilling holes and can be easily installed with adhesive tape; it can be installed on the left or right side of the window. COMPLETE KIT: This window restrictor model comes with everything you need to install, use, maintain and clean the window clips in a complete kit. Simple and reliable window opening adjustment: The no-drill window restrictor offers 2 levels of window opening to ensure safe and easy operation of the tilt mechanism. VERSATILE APPLICATION: The window restrictor is suitable for all sash windows with rubber sealing strips. This window stopper is very versatile and can be used on all windows with rubber sealing strips. High-quality plastic and metal design: The very practical window stopper has been carefully designed and manufactured for long-lasting use without frequent replacement.