This 1.50" ID Wall Eye Wall Port fits provides a fully tubed pass through, that can penetrate a wall or other barrier with a thickness ranging from 5 3/4" to 8 1/2". Once installed this unit allows the running of cables, cords, wires, tubes, etc.. from one side of the wall or barrier to the other through an aesthetically pleasing port. It is recommended to install this unit in a 2 1/8" hole.