A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-00-106-7281
NSN 2925-01-501-1104
NSN 5935-01-020-8274
NSN 5965-01-343-3950
NSN 5930-00-669-7467
NSN 5855-01-152-5849
NSN 5985-01-418-4207
NSN 5935-01-364-8212
NSN 6130-01-065-2368
NSN 6610-00-767-4602
NSN 6610-00-388-0094
NSN 5996-01-656-2461