4" Inside Diameter Unit - 1.00" to 1.50" Thickness Range Table Grommet This is our 4" ID

This is our 4" ID White Wall Eye that fits a wall thickness ranging from 7" - 11 1/2" in thickness

This 1/2" ID Wall Eye Wall Port fits a wall thickness of between 5 3/4" - 7 3/8" in thickness

This is a port that runs from one side of a wall to the other

This 2 1/2" ID Premium Flapped Unit - Fits Barrier Thickness between 4" - 6"

4" Inside Diameter Unit - 1.00" to 1.50" Thickness Range Table Grommet This is our 4" IDThis is a 4" Inside Diameter Unit 1. 00" to 1. 50" Thickness Range. You will need to have a hole that ranges from 4 7 8" 5 1 8" for installation, with 5" being our ideal installation hole size. This is a 2 piece unit that screws together from each end of the barrier you are penetrating, so you much have access to both sides of the object (such as a wall, floor, desk, etc.).