A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-146-6485
NSN 6150-01-445-6134
NSN 6110-01-589-0441
NSN 5895-01-044-6369
NSN 5935-01-462-1725
NSN 5998-01-027-0855
NSN 6620-01-196-7670
NSN 5975-01-146-4012
NSN 5930-00-597-5064
NSN 5925-01-262-0759
NSN 6105-00-247-8695
NSN 5935-01-573-7519