The hooks secure the ladder to the window frame or to the sill of most windows and won’t slip off. The ladder hook is RETRACTABLE, please extend the ladder hook at both ends to the maximum when using. No assembly or tools are required, easy to use and fast to deploy, built for emergencies. Please replace it every three years to ensure its usability. Strong and durable escape ladder, slip-resistant rungs provide a steady foothold, can escape quickly and easily. Tested for up to 1000 lbs, it extends to 13 feet for use in second-story rooms. Comes with a red canvas bag for easily stored under a bed or near a window.