A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-219-3007
NSN 5965-01-345-9480
NSN 5990-01-139-6042
NSN 6110-01-050-1283
NSN 6150-01-264-8020
NSN 5996-01-215-0944
NSN 5998-01-170-8218
NSN 6685-01-477-1756
NSN 6220-01-406-2051
NSN 5945-01-274-1612
NSN 5950-01-012-2968
NSN 6610-01-383-7419