A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-00-151-9827
NSN 5925-00-215-3758
NSN 5855-00-688-9954
NSN 6685-01-076-2678
NSN 4140-01-586-5845
NSN 5998-00-288-5533
NSN 5990-00-883-2962
NSN 5950-00-135-9488
NSN 7035-01-138-5781
NSN 5960-01-044-4902
NSN 6620-00-621-6951
NSN 5996-01-095-1356