a directional boring device is provided for attachment to a carrier having a power source for providing a first power supply to the boring device for moving the device and a second power supply for operating the device . the boring device includes an attachment frame , and a selectively attachable first coupler for coupling the attachment frame to the first power supply to permit movement of the device . a drill tool assembly is provided that includes a drill head , a drill stem attachable to the drill head , a drill bit attachable to the drill stem and a drill assembly power transmission . the drill assembly power transmission imparts rotational and axial movement to the drill tool assembly whereby the drill assembly transmission is capable of moving the drill head and drill stem in a path generally parallel to the plane on which the carrier rests . a selectively attachable second coupler is provided for coupling the second power supply to the drill assembly power transmission for permitting the carrier power source to supply power to the drill assembly power transmission to operate the drill tool assembly .