A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-622-5017
NSN 5895-01-065-6087
NSN 5965-01-600-0444
NSN 5999-01-634-0576
NSN 5930-01-482-2723
NSN 6110-01-336-7944
NSN 5920-01-579-3193
NSN 7035-00-215-3272
NSN 4140-00-408-9989
NSN 5905-01-234-6345
NSN 5999-00-518-1007
NSN 5998-01-033-5047