A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-443-6048
NSN 6685-01-304-4374
NSN 6110-00-534-1441
NSN 6110-01-015-2866
NSN 5910-00-160-2400
NSN 6135-01-014-9755
NSN 6610-01-179-0116
NSN 6645-00-623-5052
NSN 5965-01-546-4628
NSN 5935-01-406-5236
NSN 6610-00-943-3097
NSN 4140-00-058-1355