This is a port that allows the passing of cables, wires or cords through a structure with an thickness of between 1/2" - 3/4". When installed you will have a fully tubed 120" opening through the barrier such as a Ceiling Tile or wall. . The Wall Eye Table/Ceiling Tile Grommet itself fits into a 1 3/4" drilled hole. This is the perfect solution if you have a thin table or desk top that needs a port for wires or a ceiling tile like those used in a drop ceiling that needs a port. These units are very easy to install and once in place, wires can be ran back and forth through the unit without the worry of the unit popping out of place. This is a sturdy, lasting option for all of you grommet needs for a 1/2" - 3/4" thick structure.