Each clip has a suction cup for easy attachment in the fish tank or on smooth surface. The clip is suitable for most standard aquarium heaters, water tubes, but not very suitable for thin airline or air tubing.

The open mouth is detachable. Just turn it. It is easy to install and remove.

Size: Plastic clip(inner diameter is 25mm) can clip 22-28mm/0.9-1.1inch diameter, suction cup diameter is 35mm, can be used for 1 inch diameter aquarium heater, PVC pipe, water tube and so on. (Please you can also find more measurement details in the photo)
Material: Made of high quality silicone rubber and soft plastic, durable and flexible, Precision die with 3D design. Perfect for fish tanks, aquariums and any clean glass surface/smooth surface.

Hi, dear. Any question please feel free to contact me firstly. I will try my best to help deal with your problems in a short time as soon as I receive your message.