A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-00-998-4573
NSN 5855-01-133-3587
NSN 5950-01-397-6469
NSN 6130-00-934-9643
NSN 5996-00-583-0796
NSN 5910-01-364-2552
NSN 7035-00-916-9380
NSN 5945-01-523-1793
NSN 5935-01-466-0838
NSN 6620-00-526-6679
NSN 5895-01-536-9616
NSN 5950-00-137-1558