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