Black oxide
A tubular item, so formed as to provide a spring action against the inside wall of a hole when driven into abutting pieces to position and hold them in place.
NSN 5999-01-057-7876
NSN 4140-00-331-0685
NSN 5855-01-328-3347
NSN 5915-01-092-8178
NSN 5945-00-682-7358
NSN 6240-01-063-7685
NSN 6145-00-705-6686
NSN 5965-00-559-1203
NSN 7035-00-870-0290
NSN 5996-00-442-3654
NSN 4140-00-445-8474
NSN 6105-01-101-8913