{HEAD ~ Two cutting inserts} are positioned in exactly opposed diametric positions, and engage {TAIL ~ the workpiece} in a substantially identical manner to precisely balance the radial forces resulting from drill axially advancing though a workpiece 
engage
{ HEAD ~ Two cutting inserts } are positioned in exactly opposed diametric positions , and engage { TAIL ~ the workpiece } in a substantially identical manner to precisely balance the radial forces resulting from drill axially advancing though a workpiece
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH