My only complaint about this item is that setting the angle based on the numbers around the arc on the product itself is quite odd and only the number of degrees appear too tenth. There is a screw that needs to be loosened to change the angle and there is a line on the frame next to that screw. This is the line you use to set the angle, which is a bit counterintuitive when looking at the clamp. What can I say, very accurate. I set it to 90 degrees and checked with a protractor and it was true 90 degrees. However, it only displays 10-degree increments. Therefore, for any fine-tuning, you need a protractor. I'm doing a project where in some cases I need to set the angles to tenths of a degree. There's no way I could have even guessed it using just the numbers on the product itself. However, it is easy to adjust with a protractor and after tightening the screw, it holds its angle perfectly. While fine-tuning can be a little tricky, it's an invaluable tool. I've never seen anything like it. I will order two more.