Exo Terra Terrarium and Aquarium Screen Cover Clips are sturdy metal clips designed to secure Exo Terra screen covers onto tanks (e.g. 10–20 gal). These clips prevent pets or feeder insects from pushing up the lid, ensuring the screen top stays firmly in place. They are easy to install and provide extra peace of mind, keeping your terrarium escape-proof and the inhabitants safe. (Use size Large for bigger tanks.). Available in Multiple Sizes