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The hole just needs to be large enough to get the bolt through. It's pretty slick. They have a nut on the inside of the tube where a second threaded piece will bolt to.
Sorry, there was a problem. Please try again later.Make sure that the grommet hole is between .5 and 2 inches (1.2 and 5.0 cm). Make sure that the tabletop or desktop thickness is between 1 and 2.8 inches (2.5 and 7 cm).
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