A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-00-516-2449
NSN 5915-01-093-6414
NSN 4140-01-032-0718
NSN 6135-01-314-8416
NSN 5920-01-501-1105
NSN 5990-00-900-4459
NSN 5998-00-118-9768
NSN 5910-01-567-2953
NSN 6105-01-358-3466
NSN 5920-01-436-5138
NSN 5996-01-206-5929
NSN 2925-01-097-0903