A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-00-353-0612
NSN 6650-01-445-9653
NSN 5975-01-197-7673
NSN 5855-00-688-9954
NSN 5925-01-451-5980
NSN 6650-01-327-0323
NSN 5925-01-371-2876
NSN 5965-00-910-3233
NSN 6150-00-171-3325
NSN 6105-01-205-1514
NSN 6685-00-241-2744
NSN 6145-00-201-1330