A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-426-7350
NSN 5975-01-310-2961
NSN 6650-01-135-7472
NSN 6650-01-006-1526
NSN 6650-00-716-7628
NSN 5935-00-538-4387
NSN 5925-00-733-4584
NSN 5910-01-401-5279
NSN 5990-01-032-8368
NSN 6135-01-351-1131
NSN 5975-00-623-0682
NSN 5835-01-268-1924