A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-789-0800
NSN 6240-01-567-3911
NSN 6610-01-391-8741
NSN 5990-01-106-3786
NSN 5925-00-312-4426
NSN 6110-01-167-2965
NSN 5910-01-068-3625
NSN 6620-01-436-3502
NSN 6105-00-527-7702
NSN 5925-00-553-9899
NSN 6220-01-240-5573
NSN 5925-01-323-5354