A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-168-1495
NSN 5965-00-973-9974
NSN 5960-00-799-4056
NSN 5935-01-012-6937
NSN 5915-01-432-0324
NSN 6685-00-942-8888
NSN 6650-01-622-5092
NSN 5965-01-546-8660
NSN 5999-01-391-6282
NSN 5996-00-156-5967
NSN 5925-01-570-7066
NSN 7035-01-314-7559