A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-420-5602
NSN 5996-01-212-4234
NSN 6240-01-064-2980
NSN 6240-01-303-6174
NSN 6320-00-682-3448
NSN 6220-01-289-5136
NSN 5985-01-623-6221
NSN 6145-00-169-4834
NSN 6150-01-311-3914
NSN 5985-01-240-9645
NSN 5930-01-025-0658
NSN 5960-01-357-1261