A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-00-436-2299
NSN 5945-01-072-9827
NSN 6645-01-043-3179
NSN 6220-01-415-2351
NSN 5945-00-156-7256
NSN 6645-01-178-4936
NSN 6645-01-607-5999
NSN 5985-01-513-2146
NSN 5835-01-235-1125
NSN 6220-00-941-4007
NSN 6650-00-125-6560
NSN 6130-01-019-0823