Using this drill extension I drilled several holes in the top plate, three 2x4s in my walls. In the attic, I drilled holes at the top of the wall panel to make holes for the network cables. Used an extension with a 2-1/2" lenox hole saw which also worked well. Use a 1/2" drill bit and cut through 2x4's at a time...remove the cut end cap from the drill bit and cut the next 2x4 out....repeat until finished. I was pleasantly surprised at how sharp, fast and smooth the cuts were.