Note: For your safety, wear gloves and goggles and pay attention to sparks and splash residue when using diamond cutting tools. The diamond cutting wheel is sharp and sturdy and is suitable for cutting gems, glass, ceramics, porcelain and ceramic tiles. Suitable for most rotary and air tools. Cutting discs diameter: 25mm/20mm/16mm; Mandrel Diameter:3.0mm. Diamond cutting disc is uniformly coated with diamond particles. It may become very hot during cutting. Adding water can extend the life of the Diamond Cutting Wheel.