A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-623-2970
NSN 5920-01-368-8609
NSN 5920-00-345-5833
NSN 5905-00-664-4218
NSN 5925-00-054-4152
NSN 5950-01-201-1579
NSN 6650-00-614-1711
NSN 5975-01-467-4915
NSN 6145-01-501-4228
NSN 6150-01-201-3766
NSN 5895-00-588-5659
NSN 5905-01-429-6066