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