A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-256-0201
NSN 6220-00-436-0692
NSN 5905-00-890-3407
NSN 5930-01-625-0475
NSN 6110-00-202-1021
NSN 6650-00-537-9222
NSN 6105-01-313-7100
NSN 5985-00-356-7277
NSN 5975-00-070-1139
NSN 6240-01-562-3309
NSN 6650-01-399-8552
NSN 6220-00-222-5663