I bought these to mount a couple of VSSL storage cylinders to the roll bar of my Jeep. The description says they hold items up to a diameter of 2 1/4. I measured the tubes, and they're a little over 2, and definitely not more than 2 1/8, and the clamp doesn't come close to fitting. Fortunately, the strap is just long enough that I was able to take a utility knife and cut out a notch that -- with some stretching and kneading -- was just big enough to fit. They actually work pretty well, but if you're trying to mount something close to or more than 2 in diameter, you may want to find something else.
Rating: [4 of 5 Stars!]