A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-350-2925
NSN 5910-01-063-4506
NSN 6135-00-754-8191
NSN 6110-00-327-6750
NSN 5990-00-964-9672
NSN 6145-00-148-5748
NSN 5998-01-413-2475
NSN 6650-01-423-8131
NSN 5910-01-500-6680
NSN 6610-01-533-2935
NSN 5960-01-265-8069
NSN 6620-01-078-6372