A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-00-336-3323
NSN 6135-00-643-4843
NSN 2925-01-511-5359
NSN 5920-01-319-5198
NSN 5905-00-285-1827
NSN 5975-00-019-1619
NSN 5945-01-553-0935
NSN 6105-01-409-2023
NSN 4140-01-535-3396
NSN 5905-01-251-4190
NSN 6240-01-412-0715
NSN 5945-01-615-2682