A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-457-2805
NSN 6645-01-029-7812
NSN 6105-01-514-2294
NSN 5855-01-256-2551
NSN 5998-01-090-1192
NSN 6610-01-089-2487
NSN 7035-01-566-3784
NSN 5930-01-368-3765
NSN 6145-01-487-8043
NSN 5985-01-448-2274
NSN 5975-00-553-3998
NSN 5945-01-660-7922