A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-420-7774
NSN 5998-00-225-8522
NSN 5990-01-277-9753
NSN 5990-01-621-6969
NSN 6150-00-227-2424
NSN 7035-01-442-7947
NSN 5915-01-653-0627
NSN 5999-01-068-0114
NSN 6610-00-897-5680
NSN 5975-01-464-4293
NSN 6645-01-542-6159
NSN 5935-01-542-8708