A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-479-0723
NSN 7035-01-178-7732
NSN 5965-00-470-9521
NSN 5960-01-270-9018
NSN 5920-00-100-7219
NSN 5985-01-456-0070
NSN 6105-00-434-5622
NSN 5910-00-679-9472
NSN 5905-01-315-1173
NSN 7035-00-915-5798
NSN 5996-00-277-7384
NSN 5915-00-690-9801