A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-00-862-0117
NSN 5990-00-201-1162
NSN 6150-01-549-6388
NSN 2925-01-138-0808
NSN 5925-01-382-9313
NSN 6110-00-006-6381
NSN 5935-01-252-1455
NSN 6610-01-172-0897
NSN 5855-01-490-0745
NSN 5925-00-265-9488
NSN 5855-01-199-2046
NSN 5855-01-068-3683