RIDGID 67955 Rod Size of two inch BSW (British Standard Whitworth and Imperial based screw thread standard) - 4 1/2 TPI (Threads Per Inch) Right Hand Cut, High Speed dies are designed as Bolt dies and are compatible with RIDGID Universal Die Heads (Nos. 504A, 711, 811A, 816, 817 and 911 Die Heads). The Die Heads can be mounted onto several different threading machines also from RIDGID 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 the sizes they are designed to cut for easy identification. Dies are crafted from tool steel and designed for right hand cutting of threads.