A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-310-8778
NSN 5985-01-071-6430
NSN 5835-01-111-9838
NSN 5910-01-423-8459
NSN 5965-01-146-1311
NSN 5905-00-426-0020
NSN 5990-01-270-3209
NSN 5996-00-205-2933
NSN 6320-01-476-7702
NSN 5990-00-195-9460
NSN 5999-01-617-6665
NSN 5975-01-464-2800