This Ortec flashlight holder ensures that you can easily attach a flashlight on a tube with a diameter of 16 to 18 mm. Think of handlebars, for instance. The velcro holder has enough room for a light with a 26 mm diameter. In practice, this includes most flashlights that run on one 18650 battery. The tube clamp can handle tubes or sticks with a diameter of 16-18 mm. Due to the double ball joint you can easily position the light. It can face in any direction. The ball joints might look a little small and fragile, but nothing could be further from the truth. They are rock-solid and pure German decency.