A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-243-5291
NSN 5835-01-406-4066
NSN 6220-01-233-7456
NSN 5950-00-061-0700
NSN 5965-01-481-2422
NSN 6620-00-935-1321
NSN 6610-01-196-9861
NSN 5920-01-078-6578
NSN 5999-01-217-7290
NSN 6620-00-730-8699
NSN 6220-01-595-0707
NSN 6110-00-271-9928