A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-362-0305
NSN 5999-01-321-0052
NSN 5905-00-842-9852
NSN 6610-01-027-8736
NSN 5910-01-471-2499
NSN 6620-00-952-4278
NSN 5910-01-620-2682
NSN 5895-01-523-2842
NSN 5999-01-590-6083
NSN 4140-01-472-7598
NSN 5999-00-146-3758
NSN 6685-00-838-3041