A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-574-4641
NSN 5905-01-209-3504
NSN 6650-00-153-3155
NSN 5996-01-254-2510
NSN 5996-00-973-4179
NSN 6105-01-380-0004
NSN 5990-00-949-8451
NSN 5930-01-492-5691
NSN 5965-01-367-7380
NSN 4140-01-417-5404
NSN 5945-01-111-7365
NSN 6320-00-194-4252