TOOGOO(R) 4pcs Suction Cups + 4pcs Clips for Aquarium Water Pipe/Heating Rod/Glass Air Tube Hose 18-24mm Fit for 18-24mm air aquarium tubing, filter tube, glass, water pipe, hose, heating rods etc. Material: Plastic Suction Cup Diameter: Approx. 0.98inch / 25mm Clip Inner Diameter: Approx. 0.6inch / 16mm Clip Outer Diameter: Approx. 0.86inch / 22mm