I bought this box to run all my cables from the roof of my van to the van. I drilled 12 holes in the sides of the box, put grommets in the holes, cut a 2 1/4" hole in the bottom of the box through the roof of the van, installed a large rubber grommet that protected the 2 1/4" wires " apart, routed the cables and sealed any gaps with lapped caulk. Seems to be working great.