A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 7035-01-368-3338
NSN 6650-00-342-6447
NSN 6135-01-616-4950
NSN 5910-01-207-0833
NSN 6150-01-041-2734
NSN 6650-01-531-4542
NSN 6220-01-318-9646
NSN 6240-01-347-0072
NSN 5998-00-554-9725
NSN 5998-00-820-5818
NSN 2925-01-523-3607
NSN 5835-01-589-4735