A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-631-4630
NSN 5930-01-032-3826
NSN 5855-01-428-9456
NSN 5998-01-247-0908
NSN 5985-01-323-3025
NSN 5945-00-816-9717
NSN 6110-01-440-1062
NSN 5935-01-162-4930
NSN 5950-00-589-2869
NSN 5835-01-540-4995
NSN 5910-01-508-4213
NSN 5999-01-202-8707