A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-00-455-2425
NSN 6145-00-598-9397
NSN 5999-01-302-9221
NSN 5950-00-101-9646
NSN 6620-01-373-4588
NSN 5965-00-081-9412
NSN 5960-00-995-2554
NSN 5895-00-342-9581
NSN 5945-01-482-4657
NSN 6240-01-152-2662
NSN 7035-01-633-9537
NSN 5905-01-516-8932