A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-00-924-3317
NSN 5935-01-019-5195
NSN 6145-01-582-4266
NSN 6320-01-352-5653
NSN 5835-01-440-5391
NSN 5996-01-442-8751
NSN 5835-01-059-5535
NSN 6610-00-558-0480
NSN 6150-01-303-5852
NSN 6240-01-422-3461
NSN 5910-01-303-7088
NSN 6105-01-228-6306