A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-579-8452
NSN 6145-00-301-9124
NSN 6130-01-009-1597
NSN 5985-00-788-9258
NSN 5835-00-876-4544
NSN 6105-01-424-8861
NSN 5895-00-953-4916
NSN 6620-01-424-6925
NSN 5975-00-682-6958
NSN 6240-00-686-5345
NSN 5835-01-190-5192
NSN 5910-01-339-7233