A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-166-9389
NSN 6135-01-648-4875
NSN 5920-01-202-7166
NSN 5965-01-165-9787
NSN 5975-01-600-8718
NSN 5935-01-317-2495
NSN 5835-01-128-7757
NSN 5996-01-093-9259
NSN 5960-01-477-9997
NSN 6685-00-702-3074
NSN 5960-00-289-6591
NSN 4140-01-578-7972