RIGID 50745 MONO one eighth inch NPT (Nominal Pipe Size) - 27 TPI (Threads Per Inch) High Speed Stainless Steel Right Hand Cut dies are compatible in the Wheeler Rex 897065 Universal Die Head and the RIDGID 97065 Universal Die Head. The Die Heads can be mounted onto several different threading machines from either RIDGID or Wheeler Rex. The Dies in the head can be easily changed and if the Die Head is mounted to a machine the Die Head does not need to be removed from the machine for die changes. Dies have notches designed into them that will click into position inside the die head with its spring balls that catch the die and allow the operator to easily know when the dies are correctly installed in the Universal Die Head. And the die blades are designed with a two-step cut method which provides a very stable bite into the pipe, allowing any external coating to be removed as the pipe is cut at the same time. Dies from RIDGID are marked for easy identification of the type of pipe and