The Sorby SteadyPro Stem is an integral part of the modular tool rest system, a stem is the key to connecting your collection of rests to your lathe. After being attached to a crossbar, jig, or other part of the modular system, the stem sits down into the banjo of your lathe. Adjust to meet your needs, tighten it in place, and get to work on your turning project. This SteadyPro Stem is most commonly used with full-size lathes. Stem is to be used only with the Robert Sorby modular tool rest systems: SteadyPro and Precision Boring Systems.