A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-152-2821
NSN 6240-01-458-4384
NSN 6145-01-386-9658
NSN 6620-00-006-6418
NSN 5996-00-781-0454
NSN 6685-00-594-2857
NSN 5915-00-837-4460
NSN 5920-01-521-5737
NSN 5998-01-557-4963
NSN 6150-01-328-8604
NSN 6220-01-315-4056
NSN 5915-00-118-0248