Preferably, the depth “DG” of the race is equal to or greater than {HEAD ~ the length} of {TAIL ~ the lip} of the largest cap to be opened 
of
Preferably , the depth “ DG ” of the race is equal to or greater than { HEAD ~ the length } of { TAIL ~ the lip } of the largest cap to be opened
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH