The Standard™ brand diamond discs are used by commercial cutters worldwide and are excellent for faceting. The Standard™ brand discs are designed to exceed the most rigid requirements. The aluminum backs are ground flat and parallel to exacting standards. Additionally, all The Standard™ brand discs are made with 100% diamond and bonded with a hard electroplated nickel. The Standard™ brand discs are also available with a 1/4"-20 thread screwback mount, allowing you to utilize the full face of the disc. This uninterrupted surface will allow you to handle larger work pieces. Other diameters, mesh sizes and arbor holes are available.