Yes they work but they don't work very well. They don't offer much clamping pressure unless you're using a 3/4 inch blank. Bought because it supposedly works 5-19mm. 1/4 inch is 6.35mm and is the thinnest I usually work with I thought it would be perfect. It doesn't fit the 1/4" shank exactly though. I got curious and grabbed a caliper that showed 7.5mm as the only thickness, you could have a board on each side and close it. 2" wood and that will work for it.
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