This box was a few dollars cheaper than others. It shipped from Vevor in California. There is a 4 position ground bar inside and it has metal plates that cover the entrance holes which are 1\". There are adapter plates for smaller sizes. However, there are only 3 cover plates and 4 holes; so if you want to enter from the back and cover all the side holes, you will be one plate short. Also, the inside of the box was not painted. I painted the inside of the box, drilled a hole in the back and fabricated an additional cover plate, as my cable was entering from the back of the box.