A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-00-497-3710
NSN 5835-01-422-2399
NSN 6685-00-035-9373
NSN 6105-01-054-5716
NSN 5925-01-506-7833
NSN 5985-01-151-8809
NSN 6650-01-485-3444
NSN 5965-01-569-3332
NSN 6650-01-527-9181
NSN 5990-01-004-6343
NSN 5935-01-197-4523
NSN 5935-00-946-9261