Abstract: An apparatus for creating or reaming underground tunnels or conduits for the laying of cable or the like, comprising a bit head having a contoured outer surface adapted to bore through dirt or wood, a rigid core shaft, and a generally cylindrical hollow outer shell having a shell diameter comprising at least one circumferential shoulder having a ridge diameter greater than said shell diameter, said shoulder being located a certain distance along the length of said outer shell; wherein said bit head is releasably secured to and is coaxial with said core shaft, said core shaft is located substantially within the hollow central portion of said outer shell, and said outer shell has a length substantially equal to the length of said core shaft such that said bit head is located outside of said outer shell.