A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-00-827-0889
NSN 6645-01-258-4314
NSN 5935-00-015-1621
NSN 5998-01-070-2006
NSN 6150-01-592-5801
NSN 5835-01-532-9373
NSN 5975-00-933-8381
NSN 6645-01-012-0424
NSN 5945-01-539-2650
NSN 5996-01-424-8650
NSN 5996-01-371-2958
NSN 6220-01-510-3927