Two opposite sides of the holding portion extend perpendicularly to form {HEAD ~ a pair} of {TAIL ~ opposite stabilizing wings} locating at a same side as the buckling slice with respect to the holding portion 
of
Two opposite sides of the holding portion extend perpendicularly to form { HEAD ~ a pair } of { TAIL ~ opposite stabilizing wings } locating at a same side as the buckling slice with respect to the holding portion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH