One problem was that the other ring, (not the one in the photo) had the hinge holes drilled off center by quite a bit. So bad in fact that it will have to be sent back and another new one shipped to me. This one in the photo is ok but the other one (already boxed for return) had one of the hinge bolts holes off centered by 3\16ths". It wouldn't clamp down on the tube because of the extra play\spacing.