The grommet will fit a 54 mm (2 1/8 in) hole. I designed this to fit my custom desk and workbench which were made from 24 and 28 inch hollow core interior doors (4 meters of work space) on Ikea legs. The height of the grommet is the thickness of the door to accommodate for the hollow core.

I printed it inverted without support and had no problem with the overhang.