A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-189-0967
NSN 5975-00-580-0434
NSN 5895-01-303-8375
NSN 6150-00-150-1763
NSN 5910-01-488-4934
NSN 5985-00-708-7245
NSN 6135-00-246-0324
NSN 6220-01-619-4878
NSN 5990-01-400-3299
NSN 2925-01-516-5113
NSN 2925-01-485-6982
NSN 6105-00-887-2204