Made of high speed steel. Right-hand cut tools have a cutting action that engages when they are run in a clockwise direction. Hex die is for dressing over bruised or rusty threads. No special holder is required for this type of die, any wrench large enough will suffice. Ideal for maintenance in the shop or field.
This die was exactly what I wanted. I used it to repair a damaged thread on a 7/8-14 jackscrew on a wheel bearing tool I have. I didn't want to cut new threads, just clean up existing threads. That made it great. The outside hex of this cube is 1 5/8 inches.