A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-364-0276
NSN 7035-00-870-0290
NSN 6645-01-472-6879
NSN 2925-01-267-1598
NSN 6150-01-282-7678
NSN 6685-00-156-3054
NSN 6685-01-569-7986
NSN 7035-01-310-2587
NSN 5915-01-186-6464
NSN 6110-01-396-7693
NSN 5975-01-495-4884
NSN 6145-01-399-0467