A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-01-148-6391
NSN 6240-01-513-0306
NSN 6240-00-197-6819
NSN 5835-01-606-8768
NSN 6240-01-425-1939
NSN 6620-00-189-0967
NSN 5895-00-585-2038
NSN 5855-01-317-5354
NSN 6650-00-267-9815
NSN 5996-00-186-8709
NSN 5985-00-201-3734
NSN 6610-01-569-6710