Purchased a long light tube for my arowana tank. It comes with suction cup, which is supposed to hold the light at the tank. But the suction will deteriorate over time and it loose it's suction strength. With this simple design, it helps to hold the light in place. Printed with ASA, been using this for over a year. There are 2 files available, one for the left and the other for the right side. Suitable for use of light tube diameter 25mm to 26mm. Glass thickness is 5mm.