A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-584-4592
NSN 4140-00-888-9836
NSN 5905-01-579-5215
NSN 5975-01-605-6686
NSN 5985-00-200-9876
NSN 5950-00-175-7551
NSN 6620-00-255-5962
NSN 5965-00-901-6203
NSN 6135-00-305-2052
NSN 6150-01-547-8691
NSN 6650-00-896-9468
NSN 5895-00-671-6758