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