A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-00-054-2915
NSN 5895-00-611-3168
NSN 5999-01-381-1139
NSN 5965-00-508-3270
NSN 5996-01-659-9365
NSN 7035-01-238-9301
NSN 6130-01-123-7586
NSN 5910-01-301-8472
NSN 5999-01-197-1240
NSN 5985-01-468-9038
NSN 5895-01-406-3445
NSN 2925-00-964-7128