A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-00-006-1475
NSN 5975-00-008-7834
NSN 5965-00-035-4556
NSN 5999-00-145-3878
NSN 5950-00-628-8806
NSN 5925-01-014-7183
NSN 4140-01-459-3136
NSN 7035-00-908-4933
NSN 6150-00-171-3325
NSN 5990-01-199-4832
NSN 2925-00-185-1618
NSN 6110-01-327-3198