A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-00-525-3295
NSN 5835-00-816-0394
NSN 5950-01-546-6251
NSN 5990-01-432-4249
NSN 5975-00-246-4906
NSN 6130-01-222-0475
NSN 6650-00-554-4150
NSN 5920-00-838-0302
NSN 5998-01-562-2555
NSN 4140-01-222-1506
NSN 6105-00-818-9695
NSN 6620-01-382-7392