A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-00-833-2516
NSN 6110-01-070-9602
NSN 5935-00-020-8278
NSN 6645-00-434-8793
NSN 6145-01-357-5648
NSN 5925-00-895-3649
NSN 6240-01-529-7819
NSN 6685-01-246-0310
NSN 6130-01-153-2265
NSN 5996-01-505-9999
NSN 5985-00-728-0207
NSN 7035-01-569-2151