Our Resin and Electroplated Diamond Smoothing Cones are engineered for precise polishing and smoothing of delicate and brittle materials such as glass, ceramics, crystals, and other super-hard surfaces. Featuring a 60-degree included angle, these cones are perfect for creating slight bevels or pre-polishing   larger bevels on the inside lips of open-ended glass vessels. With multiple mounting and threading options, you can select the ideal setup for your application.