For bowl gouges from 12,7 - 28,5 mm diameter. Device for grinding fingernail shape, Ellsworth, Irish or Liam O´Neil grind or Celtic grind at bowl and spindle gouges. Produces consistently sharp, repeatable geometries on turning tools for the wood turner. This shape is superb for rapid hollowing, is useful on the outside of bowls, and is suitable for some spindle work. Once you learn how to use it, it will become one of your favorite grinds.