Ozzistraightshooter  Die for Springfield 1.04 inch x 10 TPI SQUARE thread.Top quality High speed steel. Die will clean up your lathe cut thread for a better fit. Die is split with fine adjustment. Difficult to manufacture square thread. Generally you need to start the thread on a lathe and use the die to improve the square thread for a perfect fit Finest ground high speed steel.These are top quality tools designed for professional use.