and abrasion resistant material such as tungsten carbide pdc or tsp structures 140 a will increase friction between the detritus cut from the formation and the side surface 114 fig5 b depicts balls or cylinders 140 b secured to the side surface 114 of cutter barrel 110 the balls or cylinders 140 b will increase friction between the side surface 114 and the detritus the cylinders or balls 140 b may be cemented welded or brazed directly on the side surface 114 or may be secured in sockets formed in the side surface 114 the balls or cylinders 140 b may comprise a wear resistant material such as tungsten carbide pdc or tsp fig5 c depicts abrasive particles 140 c carried on side surface 114 of cutter barrel 110 the abrasive particles 140 c can be tungsten carbide natural diamond or synthetic diamond the abrasive particles 140 c may be cemented welded or brazed on the side surface 114 or the abrasive particles 140 c may be cast or otherwise incorporated directly into the material of cutter barrel 110 the abrasive particles 140 c may also be formed into an insert by a process such as casting or sintering the insert can then be disposed in a complementary receptacle in side surface 114 embodiments where the abrasive particles 140 c are integral with the side surface 114 provide an.