This is another cable transit through the top of a Lack worktop or other surface about 50mm thick. Designed to allow a USB cord and a few pairs of 12 Volt twin to pass through. There are two versions. The first version had an internal diameter of 16mm, but the rear nut was a bit scratchy looking due to the wall thickness, so I reduced the internal diameter to 15mm. Unfortunately, some USB printer plugs with thicker covers may not fit through the 15mm tube, so I've uploaded both versions in case you have similar issues.
The lead-through will be able to accommodate board thickness from 50mm to around 60mm, which will leave around 5mm threaded. I used a 25mm Forstner drill bit to ensure a nice clean cut in the cardboard Scandinavians call furniture. There is only 2.5mm of edging to cover any tear.
