The different color codes provide for {HEAD ~ easy identification} of the proper location for {TAIL ~ the rail assembly} 
The different color codes provide for { HEAD ~ easy identification } of the proper location for { TAIL ~ the rail assembly }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL