A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-050-9080
NSN 5925-00-761-2143
NSN 6150-01-612-6561
NSN 7035-00-406-0568
NSN 5945-01-119-4019
NSN 6145-01-301-6015
NSN 6145-01-208-9892
NSN 5965-01-526-8967
NSN 4140-00-466-9268
NSN 5835-01-486-4191
NSN 5935-01-360-6791
NSN 5930-01-211-8336