{HEAD ~ The fastener profiles} normally carry a thickened base so that {TAIL ~ the profiles} will stand without undue tipping for better interengagement with one another 
{ HEAD ~ The fastener profiles } normally carry a thickened base so that { TAIL ~ the profiles } will stand without undue tipping for better interengagement with one another
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH