A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-327-2389
NSN 6320-00-977-3930
NSN 5915-01-459-7486
NSN 6610-01-419-0352
NSN 4140-01-075-5455
NSN 5935-01-647-2496
NSN 6620-01-440-1579
NSN 6240-01-058-8868
NSN 7035-01-265-0216
NSN 6240-00-369-9768
NSN 5985-00-402-1440
NSN 5975-00-968-7650