A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-00-327-2061
NSN 5930-01-547-3747
NSN 7035-00-868-2640
NSN 5895-00-505-2911
NSN 6620-00-166-0556
NSN 6145-01-615-1497
NSN 5965-01-497-5961
NSN 5999-00-269-5320
NSN 6320-01-183-8196
NSN 6110-01-268-0418
NSN 6150-00-448-2357
NSN 5915-00-234-7702