Precautions before use: 1. Please pay attention to protective measures, such as eye protection, masks, gloves, etc., and be sure to use a saw machine with a protective cover. 2. When installing the diamond saw blade, be sure to tighten the fastening nut to prevent the saw blade from jumping during use. 3. Please note that the installation direction is consistent with the direction of the cutting equipment. 4. Clean the surface of the cutting equipment before use. Do not have steel bars, wires and easily entangled items, which May cause the saw blade to crack. If there are debris and debris during use, please clean them in time.