{HEAD ~ The bracket diameter} is measured from {TAIL ~ a center axis} extending through a center of the truncated cone 
{ HEAD ~ The bracket diameter } is measured from { TAIL ~ a center axis } extending through a center of the truncated cone
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH