A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-00-419-9590
NSN 5996-00-834-8242
NSN 6130-01-463-7402
NSN 6150-01-269-0368
NSN 6240-01-642-8377
NSN 6135-00-577-8429
NSN 5990-00-424-8872
NSN 5925-00-445-6978
NSN 5835-01-013-9321
NSN 5910-00-403-8872
NSN 6320-01-564-0893
NSN 5999-00-854-5065