A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-01-151-0238
NSN 6650-00-965-6418
NSN 5945-00-876-1143
NSN 5998-01-193-0116
NSN 5996-01-145-2784
NSN 5915-01-533-3229
NSN 5835-01-025-8761
NSN 6135-01-265-1384
NSN 5996-01-282-9635
NSN 5985-00-173-9350
NSN 5998-01-613-6236
NSN 5985-01-479-4469