A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-045-8116
NSN 5945-01-476-8873
NSN 2925-00-778-0645
NSN 4140-01-438-2806
NSN 5835-01-193-6192
NSN 6685-01-024-0530
NSN 5998-00-922-9218
NSN 6110-01-209-6906
NSN 6650-01-166-1914
NSN 6650-01-579-2137
NSN 6620-01-215-0470
NSN 6135-00-180-5125