A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-00-931-3656
NSN 6610-00-014-5820
NSN 5965-00-479-9567
NSN 6240-00-660-8467
NSN 5975-01-256-0926
NSN 6145-00-179-2493
NSN 5905-01-384-2154
NSN 6145-00-078-6344
NSN 5975-01-388-7358
NSN 6610-01-211-6182
NSN 6110-01-481-9550
NSN 5855-01-495-6457