A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-00-096-1682
NSN 5975-00-129-6056
NSN 5895-00-348-0508
NSN 6620-01-245-0184
NSN 6620-00-140-2683
NSN 6130-01-352-5644
NSN 6685-01-617-1867
NSN 5965-01-288-4736
NSN 5920-00-842-0236
NSN 5985-01-586-1934
NSN 6320-00-456-0836
NSN 6110-01-425-6467