The Brilliant Bit . Made from a solid brass body and stainless steel set screw, this bit will not corrode over time. Techniglass uses a proprietary diamond bonding technique to layer diamonds to the metal for a more uniform result. The design improves bit performance by reducing the amount of vibrations transmitted through the glass which produce fatigue cracks. Ultra fine bit is ideal for delicate glass, such as dichroic, mirror and antique, to prevent chipping. Also an excellent edge finisher for fusing pieces.