A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-388-0919
NSN 6650-01-533-7109
NSN 5960-00-074-3727
NSN 5835-01-485-0210
NSN 6685-01-394-4984
NSN 6685-00-881-7305
NSN 5935-01-099-8382
NSN 6645-00-994-6664
NSN 5985-00-220-9065
NSN 5999-01-206-0597
NSN 5895-00-113-4647
NSN 6135-00-947-0406