A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 7035-01-227-2546
NSN 5915-01-517-9837
NSN 6650-01-095-4987
NSN 6110-00-901-8215
NSN 6130-00-885-4046
NSN 5910-01-308-4408
NSN 5985-01-160-7140
NSN 7035-01-337-8128
NSN 5945-00-900-7581
NSN 5960-01-553-4557
NSN 6130-00-111-3328
NSN 6105-01-605-1972