A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-021-6633
NSN 6650-00-496-8762
NSN 6320-00-456-0836
NSN 5998-00-248-6943
NSN 6610-01-567-7242
NSN 5998-00-189-7976
NSN 5950-00-346-9364
NSN 5935-01-142-8798
NSN 5930-01-476-9516
NSN 6645-00-296-8310
NSN 5930-01-335-7508
NSN 2925-01-166-1527