Abstract: A drill bit consisting of a tubular, main body member having a set of threads at one end thereof connectable to a drill stem and an annular mounting edge on an opposite end thereof, the mounting edge having a plurality of circumferentially spaced, longitudinally disposed recesses, the main body member having an enlarged annular portion adjacent the annular mounting edge, the enlarged portion of the main body member having a plurality of circumferentially spaced recesses disposed at an angle relative to the axis of the main body member, each of the recesses in the enlarged portion of the main body member being disposed between a set of recesses in the annular mounting edge and providing a pair of converging surfaces, a plurality of blades, each of the blades being disposed in a recess in the mounting edge, substantially radially relative to the axis of the main body member, having a recess receiving a wall portion of the main body member and a surface aligned with a surface of an adjacent set of the sets of co