This is a Super heavy duty bar stock fitting.
Brass 1/2 NPT Female X 1/4 NPT Female Pipe Hex Reducing Coupling ----- Solid Brass USA
1/2 F NPTF x 1/4 F NPTF
Pipe thread measures much larger than the stated size.
Recommended for grease, refrigeration, instrumentation and hydraulic systems. Use with brass, bronze, and iron pipe.