I bought this help with picture framing and setting up my 3D printer. The clip is plastic with a pretty solid spring mechanism and looks pretty solid. They have rubber feet that you put on the clamp to protect the work piece and stay nice and tight. Also included is a pair of point grip gloves to keep it handy. I was able to level my 3D printer easily with these clamps and plan to use it with picture frames in the future. I would recommend these clips and buy them again!
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