Beveling Auxiliary Base is used together with air polishers to accurately create beveled edges for stones between 15~45 degrees. This new product will remove the guess work and inconsistency normally exist when fabricators polish beveled stone edges with diamond polishing pads. The product is also called Wet Air Chamfering Machine or Chamfering Auxiliary Base. Size of mounting hole is a little over 2" (52mm) for Gison air polisher GPW-7.