A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-583-8853
NSN 6240-00-251-5235
NSN 5960-00-621-0535
NSN 5925-01-579-6730
NSN 5998-00-343-6815
NSN 6220-01-082-7766
NSN 6130-01-206-6763
NSN 5998-00-538-2080
NSN 5920-01-321-9037
NSN 2925-00-456-7627
NSN 5910-00-470-2772
NSN 5985-01-035-0432