A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-067-9524
NSN 6610-01-218-4188
NSN 6130-00-822-4903
NSN 6620-00-555-3992
NSN 5930-01-423-8646
NSN 5925-01-236-6722
NSN 5998-01-292-1981
NSN 6320-00-468-5015
NSN 6135-00-777-5562
NSN 6610-01-555-6654
NSN 5996-01-592-4339
NSN 7035-01-137-0620