This is a desk grommet to pass cables from under a desk through to the top. The lid is locking so simply push it in place and twist it to keep it secured to the base. 

I originally made this because my store bought desk grommet would consistently pop the lid loose from the pressure of the cables being ran through it. This one alleviates that issue by locking the lid into place.

Desk hole size: 2 inch (50.8mm)

This model can be scaled to fit whatever size you need.