Every screw mechanism in this clamp is unreliable. The screw that adjusts the clamp itself is very difficult to turn. It 'feels' very tight when adjusting, but this is only because it is so hard to turn and not because the clamp is tightened! I very nearly lost a piece of equipment the first time I used the clamp because I thought it was tight when it wasn't.
The screw adjustment that allows you to vary the angle of the clamp is the exact opposite... I can't tighten it at all. This means that at any time during an experiment, if someone bumps the clamp, it can easily tip right over.
The portion of the clamp that attaches to the ring stand doesn't seem to fit properly either. I am not sure if this is because the pole of the ring stand is too skinny or the clamp is too large, but they just don't seem to go together in a way that gives a good secure hold.
This clamp is utterly useless to me.
Review by Ronald
Needs just a little more adjustability, but I made them work.
Review by Gaylynn
Happy with this item. It does the job we need it to do.
Review by Pedro
It is perfect! The quality is great and the shipping was very fast! I highly recommend people to buy it!