A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-600-0444
NSN 6240-00-258-2389
NSN 5930-01-232-1554
NSN 5895-00-234-3305
NSN 7035-01-607-5834
NSN 5930-01-570-2292
NSN 6110-01-522-3489
NSN 5930-00-932-3586
NSN 2925-01-053-5697
NSN 6150-01-442-4361
NSN 6320-00-701-0437
NSN 6220-01-347-0041