2 Story Portable Ladder - 15 ft in length.Hooks are made to fit wall thickness up to 14" deep! Great for brick buildings, older homes, brownstones, and college dorms where walls tend to be thicker.Window width (side to side) should be a minimum of 13" wide.Suitable for most standard windows 11.5 inch wide rungs Chain tension tested to 1000 pounds in weight -Manufactured of heavy duty zinc plated 18 gauge steel -Designed for quick & easy deployment with tangle free steel link chains Ladders store easily under bed or window 5 pairs of stand offs included to keep ladder away from building (Includes enough for every other rung) Stand offs MUST be assembled by customer prior to use. Simply screw them into selected, pre-drilled rungs.Adjustable positioning of the stand offs can help avoid windows beneath. Ladders can be used more than once allowing for fire drills -Limited Lifetime warranty