Abstract: A device and method for enlarging a bore and installing a utility line. The device comprises an elongate shaft having a first and second end. The first end of the shaft is connectable to the drill string of a horizontal boring machine. The second end is connectable to a utility line or other device to be installed in the bore. The device is pulled through a pilot bore and enlarges the bore to a desired diameter while simultaneously pulling in a utility line. A set of cutting elements supported near the first end of the shaft, with 120 degree spacing therebetween, enlarges the bore to an intermediate diameter. A series of blades are supported on the shaft between the cutting elements and the second end. The first blade further enlarges the hole behind the cutting elements to the final desired diameter. Along its outer edge, the first blade comprises a plurality of teeth adapted to slice through the wall of the bore.