A basic filament guide/ grommet for IKEA Lack table!
You will need a 14mm drill bit to drill an hole through the table to fit the filament guide, use a slow setting on your drill as the bottom is made up a compressed cardboard and can tear out easily - the center is also hollow with a cardboard grid and can throw the drill bit off center.
Use clamps to attach a scrap pieces of wood on top and bottom, drilling through the wood for clean cut through the table.
The filament guide will then need gluing into place!
The inner diameter is 12mm and length 60mm.