Designed for overhead lighting, this black, chrome-plated steel Boom Arm from Impact telescopes from 46 - 86" and supports up to 8 lb at maximum extension. Features include a ratcheting pivot clamp handle and rubber-coated section above its counterweight hook for comfortable, secure height adjustment. The boom has a 5/8" receiver and is an ideal match for heavy duty wheeled stands like Impact's LSP-SW10 9.5' Steel Roller.
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I liked everything about the arm except how it sat on the standard Impact C-stand. Rather than it fully dropping down onto the stud and being able to tighten the lock screw, the screw unfortunately lines up right at the angled shelf part of the stud, so when it tightens down it lifts the entire unit up until the locking screw is sitting against the vertical part of the stud. This also means the entire weight of the book and its load is on that screw. The load should be sitting on the top of the stud where it should meet the bottom of the inside receiver of the boom. For this reason I returned it. Just felt wobbly and an odd force on that tiny screw.
This is the second one I've purchased, great to pair with a c-stand for hanging sound blankets. They've been working so well I'll probably buy a third soon.