A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-01-198-7912
NSN 5920-00-064-3523
NSN 5945-01-590-7443
NSN 5998-01-533-7722
NSN 6610-00-933-1380
NSN 2925-01-015-2354
NSN 4140-01-551-3469
NSN 6645-01-477-4094
NSN 2925-00-456-7627
NSN 5998-00-783-8159
NSN 6150-01-178-1050
NSN 5990-00-965-0495