Abstract: An improved drilling tool for drilling into the through walls for the purpose of inserting cabling within same, comprising a drill bit and an elongated primary shaft suitably adapted to create a chaseway within a wall during the drilling process. The elongated primary shaft may itself be the chaseway, in which case it is hollow, or it may carry a chaseway in the form of a conduit placed over a solid primary shaft. The cabling is then placed into the wall by use of the chaseway or by use of a separate conduit inserted into the wall through the chaseway.