A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-055-8146
NSN 5920-01-436-5138
NSN 6650-00-349-8732
NSN 4140-01-541-4286
NSN 6685-00-674-2396
NSN 5930-01-627-2291
NSN 5996-01-100-3731
NSN 5998-00-282-2097
NSN 5950-01-381-5610
NSN 5835-01-430-4765
NSN 5975-01-099-4695
NSN 6685-01-388-2574