{TAIL ~ Each pocket} is formed into a shape forming a narrow opening portion at the inner race side and {HEAD ~ a wide opening portion} at the outer race side 
{ TAIL ~ Each pocket } is formed into a shape forming a narrow opening portion at the inner race side and { HEAD ~ a wide opening portion } at the outer race side
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH