A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-522-3425
NSN 2925-01-294-4125
NSN 7035-00-188-6674
NSN 5998-01-322-8303
NSN 6110-01-492-9694
NSN 5945-00-176-4750
NSN 7035-00-890-7649
NSN 6220-00-554-5937
NSN 6240-00-292-3237
NSN 5895-01-437-8871
NSN 5945-01-367-4427
NSN 7035-01-644-5251