Drill bit for boring earth and other hard materials

A removable cutter insert assembly for a boring or excavating tool, the removable cutter insert assembly comprising:

• a body extending between a first end and a second end along a longitudinal axis of the body with a connecting arrangement positioned at the first end of the body for coupling the body to a portion of a rotating boring or excavating tool, wherein a diameter of the first end is substantially the same as a diameter of the second end;
• a cutting head that is releasably coupled with the body, the cutting head comprising a leading end and a trailing end, wherein:
• the leading end defines a recess having at least one sidewall and a bottom surface, the leading end comprising an outer surface that tapers inwardly towards a central axis of the cutting head;
• the trailing end comprises a receiving portion for receiving the second end of the body in an internal cavity defined by the receiving portion to allow the cutting head to be releasably coupled to the second end of the body;
• the internal cavity and the recess are separated by a wall;
• a leading tip portion for cutting into earth is seated within the recess and against the bottom surface of the recess, wherein the leading tip portion comprises a distal outer surface that extends past the leading end and is substantially flush with the outer surface of the leading end;
• the leading tip portion is coaxially aligned with longitudinal axes of the body and the cutting head;
• and
• a retaining arrangement to retain the second end of the body in the receiving portion of the cutting head.