Excellent counterforms and an optional ball clamp support for counterforms of violin, viola and cello. Once on the bench or on a block of wood to be kept in the vise of your workbench, you can direct the counterform as you wish with the simple release lever, and thus facilitate the work of roughing out, thicknessing and finishing of the instrument. Used in a great number of Cremonese workshops. Matching counterforms are sold seperately.