A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-597-9565
NSN 5960-01-075-7732
NSN 5910-01-291-2256
NSN 5990-01-277-9753
NSN 5998-00-959-6018
NSN 5920-01-144-8920
NSN 6320-00-228-5678
NSN 5998-00-533-5792
NSN 4140-01-463-9299
NSN 5930-01-566-9587
NSN 5985-01-542-5111
NSN 5930-01-102-1537