A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-482-1591
NSN 5835-01-571-4083
NSN 5895-01-511-1430
NSN 6130-00-777-6438
NSN 5965-00-350-2367
NSN 6240-01-224-7656
NSN 6150-00-241-5439
NSN 5996-01-598-4219
NSN 6135-01-317-6021
NSN 5925-01-145-4565
NSN 6320-01-172-6103
NSN 6645-01-620-3483