A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-068-0361
NSN 6610-01-526-2054
NSN 7035-01-217-7474
NSN 5835-00-594-4921
NSN 5985-01-399-7269
NSN 6650-01-152-9425
NSN 5960-00-856-4768
NSN 5990-00-226-7894
NSN 2925-01-400-2286
NSN 5996-01-417-3139
NSN 5910-00-282-2531
NSN 6650-00-475-7746