Instruct: Classify the given review as either positive or negative.
Query: Baffled by good reviews...

Guitar center was out of c clamps so I got two of these in a pinch. They are plastic. The clamping screw easily cuts it's way through it's own seat when trying to tighten these up enough to get your lights to hold position. On 1.5 inch DJ light stands they seem nice, they look nice, but they do not hold position. With the insert out, on 2 inch global truss, they do not hold position. If you just dangle your toys off the pole and let them point where ever they fall, these work great. If you like to arrange your lights, have control of where they point, and want them to stay there, skip these and get something made out of metal with real clamping force. If scratching up your truss pole bugs you, you may seriously want to consider another hobby.