A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-536-2640
NSN 5920-00-636-0128
NSN 5975-01-359-4848
NSN 5920-01-501-5469
NSN 5998-01-403-2586
NSN 5965-01-197-6924
NSN 5996-01-164-0433
NSN 5895-01-606-7117
NSN 5835-01-347-8714
NSN 6110-01-284-5200
NSN 5905-00-455-7272
NSN 5935-01-303-6111