A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-00-904-9580
NSN 6135-01-059-4055
NSN 5915-01-447-3151
NSN 6685-01-255-6981
NSN 5975-01-554-7778
NSN 5935-00-490-3921
NSN 5945-01-458-2874
NSN 5950-01-587-3463
NSN 6610-01-112-0447
NSN 6105-01-396-0336
NSN 5998-01-219-2217
NSN 6130-00-959-5800