Workbench Grommet

Basically this is heavy duty version of the desk grommet (see http://www.thingiverse.com/thing:2411 ) designed to be used in a workbench.

Rather than just sitting on top of the hole with a lip, this grommet countersinks into the hole and could be glued or screwed in place (3mm screw holes provided).

The "cap" is modeled on a heavy manhole cover 2 parts with a small hole in the center (big enough for a cable or two - but also to get your finger in to help move the cap).

The idea was for a way to drop cables through the workbench but at the same time be able to close the hold with something solid enough to stand things on.