Upon expansion of the underlying base ring, the inserts break through the sealing material and penetrate {HEAD ~ the surrounding tubular} to enhance {TAIL ~ grip} when high differential pressures are encountered 
to enhance
Upon expansion of the underlying base ring , the inserts break through the sealing material and penetrate { HEAD ~ the surrounding tubular } to enhance { TAIL ~ grip } when high differential pressures are encountered
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH