A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-006-6138
NSN 5950-01-100-3263
NSN 6610-00-235-9784
NSN 7035-00-007-5188
NSN 5950-01-605-2823
NSN 6130-00-082-1262
NSN 6650-01-599-5668
NSN 6105-01-091-0512
NSN 5920-01-351-2193
NSN 5965-01-530-8875
NSN 5935-01-444-4030
NSN 5990-00-391-6207