Ceramic is a poor conductor of heat, which is why this bur does not heat up like metal ones, significantly reducing the risk of burns or accidents. This special bur is designed for working with acrylics, keeping them cool to ensure a perfect cut. ISO: - Maximum Speed: 50,000 rpm - BELL SHAPED GRIT Diameter: 060 - Shank: HANDPIECE - Application: COARSE ACRYLIC GRINDING - Packaging Quantity: 1