A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-292-2761
NSN 5895-01-629-4827
NSN 5930-00-216-7511
NSN 5910-01-398-3294
NSN 5930-00-233-6725
NSN 6150-00-202-4134
NSN 5950-00-105-7737
NSN 6650-00-266-6808
NSN 5975-01-462-2829
NSN 5935-01-156-5794
NSN 5975-00-336-3481
NSN 6150-01-051-6489