On {TAIL ~ the outer peripheral edge} of the flange 11a are formed an engaging edge 11e and {HEAD ~ a cutout} 11g 
On are formed
On { TAIL ~ the outer peripheral edge } of the flange 11a are formed an engaging edge 11e and { HEAD ~ a cutout } 11 g
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH