A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-523-0360
NSN 5950-00-733-0510
NSN 6150-00-119-0818
NSN 6110-01-276-0009
NSN 5915-01-151-4766
NSN 6320-01-329-8380
NSN 5990-01-255-7387
NSN 6150-00-467-0803
NSN 5905-01-403-2806
NSN 6145-01-366-1367
NSN 6150-00-176-9112
NSN 6145-01-376-3577