Features: FAST AND EFFICIENT DRILLING: The four-blade-cross design enables rapid drilling, reducing the time and effort required to complete your projects. The eccentric shape allows for better control and stability during drilling, reducing the risks of slipping and ensuring accurates hole placement. CLEAN AND SMOOTHING HOLES: Our drill bitand 39 s unique design minimizes splintering and produces clean, smoothes holes in various materials. Enjoy professional-grade results and a polished finish every time. VERSATILE USE: These drill bits are suitable for various materials, including wood, plastic, concrete, brick, marble, glass, ceramic, and metal. It offers the versatility you need for a wide range of projects. ENHANCED DURABILITY: The premium material provides increased hardness and resistance to wear to withstand heavy-duty use, ensuring these drill bits maintain their sharpness and performance over time. The spirals-groove design clears particles quickly and decreases friction and heat for a fast and cooler drilling performance. COMPATIBLE TOOLS: The set includes 7 most commonly used drilling sizes (3 or 4 or 5 or 6 or 8 or 10 or 12mm) to meet your needs. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Specification: 7pcs (3 or 4 or 5 or 6 or 8 or 10 or 12mm) Package List: 7pcs Concrete Drill Bit Set