A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-607-5524
NSN 6145-01-014-6260
NSN 6650-01-113-7563
NSN 6110-01-357-9698
NSN 5996-01-165-7326
NSN 5925-01-145-0074
NSN 6105-01-615-4935
NSN 5950-01-436-6142
NSN 6645-01-411-5657
NSN 6650-01-037-9755
NSN 6110-00-368-8198
NSN 5905-01-443-0983