A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-412-0058
NSN 5895-01-572-8997
NSN 5930-00-490-0314
NSN 6620-01-408-4464
NSN 6110-01-327-6630
NSN 5985-01-268-1804
NSN 5950-01-212-2838
NSN 5910-01-236-2560
NSN 6240-01-139-3377
NSN 5960-00-008-6503
NSN 5915-01-077-7965
NSN 6145-00-147-5440