Here is a large traditional solid rubber blanking grommet to fit a 44.4mm (1.75") panel cut out (Hole).   Most sold nowadays are hollow.   The material of the surrounding area can be up to about 3mm thick.    Suitable for many purposes including classic car and cabinet furniture.   They seem to go missing over the years and are very hard to find in this size.   Please see our shop listings for 1.5" and 2" blanking grommets, and also for larger sizes of cable grommets (with a hole in the middle).