I used a drill bit to drill a hole through the firewall stud which is 7" below the outlet. There were nails in the hairpin, and the drill could pierce them. The 7/16 hex shank and long length gave the drill the ability to drive nails without the use of an extension. With a short 3/8 drill bit with an extension, I cut off the shank there because of the nails. It was definitely the best tool for the job.