A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-309-9216
NSN 5935-01-145-2521
NSN 6130-01-200-0358
NSN 6145-00-066-8695
NSN 5975-01-590-6793
NSN 6135-01-529-8523
NSN 5920-00-905-1831
NSN 6645-00-880-5927
NSN 5996-01-292-2761
NSN 6130-01-619-9789
NSN 5999-01-013-9236
NSN 5905-00-869-8049