A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-140-8201
NSN 5999-01-177-2434
NSN 6130-01-647-1215
NSN 5990-01-157-0441
NSN 2925-00-824-2186
NSN 5996-00-076-2267
NSN 6150-01-068-1848
NSN 5960-01-515-4791
NSN 5985-01-168-5295
NSN 5945-00-101-8629
NSN 7035-01-065-3744
NSN 5996-01-018-1635