The "Ultra Protect" basement window well covers are designed with "Safety" & "Security" for your home and family in mind. These professional grade lightweight basement window well covers are built using clear impact resistant, UV-resistant, polycarbonate sheet plastic and structural grade aluminum. Installing an "Ultra Protect" basement window well cover over your open basement window well minimizes the risk of persons or animals falling into deep, uncovered, unprotected basement window wells, preventing possible serious injury. When properly installed using our solid steel "SAF-T Lock" locking system (included) these covers will support a minimum of 250 lbs. This locking system features a pull pin release that quickly unlocks the cover from inside the basement window well without the use of a tool (required by building codes) making for a quick and easy exit in case of emergency. The model EL500 (48 in. x 21 in. Elongated) window well cover is designed for use over typical corrugated steel window wells. After installation this cover can be trimmed if needed to the profile (plus up to a 1 in. overhang around the perimeter) of any type basement window well (steel, concrete, block, timber etc.) by using an ordinary jigsaw equipped with an aluminum cutting blade (8 to 12 teeth per inch blade for best results) making for a perfect fit window well cover over any type window well. See our product line of window well egress escape ladders sure to have a size to fit your window well.