Each channel section may include {HEAD ~ a flange} along at least one side thereof, {TAIL ~ the connection mechanism} being provided on the flange 
Each channel section may include { HEAD ~ a flange } along at least one side thereof , { TAIL ~ the connection mechanism } being provided on the flange
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH