A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-00-597-8725
NSN 6145-01-222-0907
NSN 5930-01-353-4142
NSN 5975-01-030-3601
NSN 5855-01-653-2155
NSN 5920-01-586-9176
NSN 5935-01-528-6332
NSN 4140-01-011-8707
NSN 7035-01-378-5074
NSN 5935-00-833-1259
NSN 6145-01-595-2804
NSN 5910-00-056-7063