A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-157-9910
NSN 6110-01-384-3913
NSN 5960-01-130-6413
NSN 5985-01-467-5306
NSN 5975-00-272-2913
NSN 5855-01-285-3483
NSN 2925-00-877-4307
NSN 6145-00-181-9622
NSN 5835-00-814-1359
NSN 7035-00-529-3128
NSN 6145-01-035-3380
NSN 6645-00-634-9317