A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-434-5097
NSN 6320-01-029-4220
NSN 7035-00-541-8516
NSN 6240-01-296-2578
NSN 5905-01-050-8400
NSN 6220-00-990-6016
NSN 5960-01-424-1781
NSN 5895-00-544-5789
NSN 5950-00-144-0590
NSN 5915-01-505-9115
NSN 6145-00-964-7466
NSN 6145-01-186-5591