What makes this attaching chalk to a base magnet so convenient is that inside the flexible soft plastic is a small square of metal with a small round magnet glued to the base is. . This magnet-to-magnet interaction makes it very strong when held and has a nice click when you remove the chalk. .You can pull the chalk out again by pressing the metal center of the chalk holder. The build quality is very good and seems a bit better than other clamps I've used in the past. The only criticism is the high price. It costs maybe $30 instead of the $50 I paid for it. What really struck me is that it costs $50 on the manufacturer's website. Which strikes me as odd. The parts are probably around $5.
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