Carbon fiber extendable pole, we have 18ft~84ft, but we can customize the products according to your request. About the diameter, the smallest inner diameter is 20.5mm, thickness is about 1.4~1.5mm. We have B series(horizontal clamp) or X series(vertical clamp) for you to choose. This model is B series. At present, we have red clamp, black clamp. The material of clamp is Nylon(PA66). We use roll-wrapped, it’s more durable. And it has lots of advantages, for example, lighter, stiff, corrosion resistance, etc. And it also has a wide range of uses: antenna mast, water fed pole, etc. If you have any questions, you can contact us at all tiems.