These heavy duty screen clips are built from spring steel and designed to fasten a mesh terrarium lid to the glass or plastic frame beneath it. The clip slips onto the top molding of the screen cover, then the bottom snaps between the frame and the enclosure rim, holding the two pieces together without screws, brackets, or other hardware. Each pack contains a set of clips so a hobbyist can secure multiple corners or sides of a single lid. Installation and removal take only a few seconds, making it simple to open the enclosure for feeding, cleaning, or handling and then reseal it afterward. The clips are intended for use on standard screen-top reptile terrariums and are offered in sizes matched to different tank dimensions.