located about the body are a plurality of pockets 17 for accommodating wear resistant inserts also referred to as 34 wear elements 34 or 34 wear blades 34 in accordance with the present invention for illustration purposes four such pockets are shown evenly spaced around the circumference of the tool however three or more such pockets may be employed if desired although the wear blades do project or extend beyond the peripheral surface of the tool body it is helpful to include at least shallow angle longitudinal recesses 18 fig2 between the pockets so as to provide ample outside fluid circulation passage as is best shown in fig6 lower blade 20 of a typical series of blade elements located in a stabilizer pocket includes at its lower end an interlock means in the form of a projection 22 or hold down lip sometimes referred to as a 34 tang 34 at a deep position within the pocket projection 22 is suitably accommodated by a mating interlock means in the form of a deep undercut recess 24 in the lower end of pocket 17 preferrably contiguous with seating surface 27 of pocket 17 it should be noted that recess 24 includes a small radius 26 at its deepest location and that adjacent radius 28 of mating projection 22 is a somewhat larger radius for a purpose to be described hereinafter blade 20 is bored at one or more places for accommodating hold down cap screws 30 and body 10 is bored and tapped from seating surface 27 in alignment therewith for accommodating the cap screws as shown it should be noted that the cap screws are countersunk.