Review on Secure Your Terrarium with the (3 Pack) Exo Terra Terrarium Cover Clip Set, Small - 2 Clips Each! by Heather Jackson

The clips themselves are in excellent condition and a good price. There are no complaints. Note, however, that they are very tight and difficult to remove. I wouldn't recommend them for a tank that you will be opening and closing frequently. The problem is they won't fit in any of my 20 gallon tanks. Aquariums are ten years or older, but they are standard aquariums. However, the clips fit my 10 gallon aqueon, which is new. They're probably mostly universal for newer tanks, but if your tank is a bit older you might have problems. The rim of my aqueon is 1" tall and I don't think these clamps will fit any more. For reference, the front of the clips (through the hole) is 1 1/8" and the top (which abuts the screen) is 1 1/4".