A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-00-081-2520
NSN 6110-00-271-9928
NSN 5965-01-383-1618
NSN 5996-01-448-6814
NSN 4140-01-197-4273
NSN 6685-00-987-5600
NSN 5996-00-596-7018
NSN 5910-00-180-2913
NSN 5996-01-547-7386
NSN 5990-01-162-9220
NSN 5996-01-633-7979
NSN 5998-01-162-5698