A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-417-3211
NSN 5920-00-144-8031
NSN 5990-01-254-3197
NSN 5920-01-008-9339
NSN 5950-01-391-5647
NSN 5965-01-335-6630
NSN 5895-00-161-6090
NSN 5855-01-428-9456
NSN 7035-01-145-5059
NSN 6110-01-633-9660
NSN 6130-00-111-1320
NSN 5935-00-385-3635