JSER - they're quite expensive though aren't they and not specifically designed for lightstands by the look of it? They look very usefl for clamping speedlights onto objects - are they part of the superclamp family or do they have another name?
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Price is a little high BUT, I have only ever bought these two, and whereas light stand ones can only be used on light stands these ban be used on stands, tripods, trees, gates, car windoes, almost anything you can clamp to so saving a small fortune in the long run.