Features: 1. Rougher surface which are quicker than the larger grit burrs when Sanding, Polishing and Engraving. 2. Various shapes available. Rich in quantity and various shapes meet your many needs. Great gift for DIY Enthusiasts. 3. The drill bit is made of quality Brazing material, which is sturdy and durable with high strength, making polishing and carving easier. 4. It can be used for glass, ceramic tiles, granite, quartz stone, marble and many other materials. 5. Note: Be sure to add water to cool the grinding head during the engraving operation to prevent it from being burned and scrapped at high temperature. It cannot be used as an impact function. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material:Brazing Size: As the picture shown Color/Style: As the picture shown includes: 1 x Bit