A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-01-561-9040
NSN 5990-01-055-4012
NSN 6220-01-306-5610
NSN 5985-01-401-5387
NSN 5960-01-180-2776
NSN 6135-01-074-8220
NSN 5965-01-256-0059
NSN 6130-01-099-4852
NSN 5950-01-139-0123
NSN 5950-01-231-9593
NSN 6220-00-795-6946
NSN 5930-01-336-5444