A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-01-438-3717
NSN 5985-00-221-1563
NSN 6135-00-027-3914
NSN 5996-01-493-4329
NSN 2925-01-078-7854
NSN 6685-01-613-2829
NSN 6145-01-607-1045
NSN 6320-01-292-6635
NSN 6110-00-943-5216
NSN 5975-01-534-7598
NSN 6620-01-510-1859
NSN 5895-01-541-0134