A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-146-0278
NSN 5999-01-604-4498
NSN 6150-01-384-2643
NSN 7035-01-462-2953
NSN 6620-01-270-0710
NSN 5905-01-329-1709
NSN 2925-00-695-4143
NSN 5950-01-223-9239
NSN 5985-01-483-7291
NSN 5910-01-400-0891
NSN 6145-01-605-0948
NSN 6130-01-242-9778