A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-570-5471
NSN 6240-01-037-2215
NSN 5835-01-193-6192
NSN 6150-00-719-6119
NSN 6645-00-171-9639
NSN 5910-00-882-5182
NSN 5935-01-258-5100
NSN 5990-00-391-6207
NSN 5985-01-522-6151
NSN 6145-00-286-9588
NSN 2925-01-159-8312
NSN 6130-01-023-8803