The DIE RRHS-BSPP 1 1/2-11 X 4 OD by Field Tool Supply is a robust threading die designed for 1 1/2-11 BSPP threads with a 4-inch outer diameter. Made from premium steel, this die offers exceptional durability and precision for creating reliable threads in various materials. It is ideal for industrial applications, ensuring compliance with industry standards for quality and performance. This die is compatible with a range of threading machines, making it a versatile addition to your toolkit. Achieve consistent and accurate threading results with this high-performance die.