ProDrill Threaded Button Bit Advantage:All around good performance,Increased hole straightness,Optimum fushing characteristics,Idealin medium-soft to hard abrasive formations causing flat face bits to become convexed as wear accumulates.
14 Semi-ballistic/parabolic carbide inserts T51 threaded drill bit with drop center face, 102mm diameter match with extension drill rod for bench drilling and long hole drilling underground.