Wood Ring Clamp For Filing, Stone Setting, & Polishing Rings This is a new wood ring clamp Great for filing, stone setting and polishing The inside of the jaws are lined to prevent marring This ring clamp is made of wood and separates at its base by a screw knob The knob gives added force to the parallel clamping It measures approximately 6" (152 mm) long Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.