The cover of the roof skylight is made of galvanized steel, and the main frame is made of aluminum. Durable and waterproof enough to resist hail, rainstorm and strong wind. Can be used for a long time. The door lock and handle design allows you to easily lock the interior, preventing outsiders from entering and giving you peace of mind. The carefully designed handle makes it easy to open and close. It can not only be used as attic skylights, escape routes, basement exits, emergency entrances, wellheads, cellars, and manholes, but also for home decoration, industry, commerce, schools, and more. The roof sunroof has 2 support rods that can slowly close onto the lid, reducing noise and preventing the lid from pinching fingers. It can be rotated 90 ° and supported. Just gently push the lid, and it will slowly open The bottom frame of the lid has pre drilled holes and is equipped with bolts for easy installation. If you want it to be more waterproof, you can fill the gaps with glue., Manufacturer: YBNKKUXKN