Content:
3/8 unc has 16 threads per inch. 7/16 unc has 14 threads per inch.
3/8 x 3/4 8x 7/16 x 1 4x
3/8 x 1 8x 7/16 x 1.1/4 4x
3/8 x 1.1/4 6x
3/8 x 1. 1/2 4x