These clips are made of spring steel and are designed to hold a screen cover firmly against the rim of a reptile terrarium. Each clip slips over the top molding of the screen cover, then snaps between the glass and the frame of the enclosure to keep the lid from shifting or lifting. No tools, adhesives, or additional hardware are needed, so the clips can be attached or removed in seconds whenever the habitat is opened for feeding or maintenance. They are intended as an added layer of security alongside a properly fitted screen cover to help keep reptiles contained. Clips are sold in packs and are offered in two sizes to match different tank dimensions.