A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-297-8820
NSN 6645-01-068-3042
NSN 5998-01-340-5644
NSN 6105-00-962-2512
NSN 5985-01-351-5056
NSN 2925-00-928-5931
NSN 6145-01-634-0388
NSN 5910-00-526-0694
NSN 6685-00-513-0412
NSN 6135-01-247-5660
NSN 5985-01-406-5209
NSN 6145-00-148-5748