A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-00-481-4449
NSN 5855-00-962-5792
NSN 5855-00-058-1293
NSN 5935-00-573-1347
NSN 4140-01-327-1858
NSN 5925-01-398-1202
NSN 5996-00-597-2234
NSN 6220-01-110-0728
NSN 5975-01-216-4289
NSN 5910-00-468-8352
NSN 5960-01-148-0074
NSN 5920-01-367-1323