A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-512-2854
NSN 5925-01-501-6465
NSN 5905-00-246-8714
NSN 7035-01-115-8996
NSN 5999-01-478-6863
NSN 5999-00-517-6778
NSN 6150-00-269-5017
NSN 5996-01-391-4529
NSN 6110-01-392-6084
NSN 5835-01-198-5142
NSN 6145-01-204-9529
NSN 6240-01-620-2450