The fine-mesh WAREMA stainless steel grille, which is mounted directly on the existing grating, keeps out little creatures like spiders and mice, as well as leaves and dirt. At only 6 mm thick, the cover is extremely flat yet is strong enough to be stepped on. The frame's profile is rounded on both sides to keep from creating a tripping hazard. The cover is easy to clean, permeable to light and air, and resistant to weathering. The light well cover can be attached with rubber tape or by being screwed in place. In addition to the standard model, versions are also available with a rear upturn beam to cover projecting window openings.