A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-315-8868
NSN 5975-00-052-1304
NSN 5965-01-227-9937
NSN 5965-00-969-5795
NSN 5960-00-285-1001
NSN 5930-01-412-5573
NSN 6650-01-571-2778
NSN 6320-01-600-0787
NSN 5975-00-350-3122
NSN 5998-00-010-8568
NSN 7035-01-467-7056
NSN 6130-00-895-3297