A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-411-0497
NSN 5895-01-576-0202
NSN 5895-01-222-0639
NSN 5925-00-694-9607
NSN 4140-01-175-3883
NSN 5895-01-254-4209
NSN 5915-00-453-1858
NSN 5920-00-976-5740
NSN 5930-00-169-5625
NSN 4140-01-108-3654
NSN 2925-01-554-5246
NSN 5905-01-265-4677