{HEAD ~ End caps} are formed with {TAIL ~ tapered tangs} which tightly fit into the central groove of the channel thereby securely fitting the end caps to the opposite ends of the channel 
are formed with
{ HEAD ~ End caps } are formed with { TAIL ~ tapered tangs } which tightly fit into the central groove of the channel thereby securely fitting the end caps to the opposite ends of the channel
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH