A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-558-4536
NSN 6105-01-053-6302
NSN 5990-01-307-4489
NSN 6620-01-415-1622
NSN 5950-01-238-0509
NSN 6620-01-330-3917
NSN 7035-00-946-2642
NSN 6620-01-462-5196
NSN 6240-01-099-2472
NSN 5960-00-999-4422
NSN 6685-01-181-6232
NSN 6620-00-764-6626