High-precision Sharpening: MR-13A drill bits sharpener excels at sharpening point angle and lip relief angle. It features 11 elastic collets - 3,4,5,6,7,8,9,10,11,12,13, suitable for 3-13 diameter of drill bits. Accurate, stable, and easy to use. Adjustable Point Angle: Our drill bits grinder sharpener provides 95° to 135° point angle adjustment, ensuring precise coordination with drill hole material and rotation speed. Robust Grinding Wheel: The CBN grinding wheel is designed for high-speed steel materials, greatly improving grinding precision and work efficiency. Plus, we also provide a professional drill bits collet chuck for your safe operation. Powerful plus Robust: Utilizing a powerful DC motor, our drill bit re-sharpener grinder operates with strong horsepower and torque, running at 4500PRM high speed while maintaining low noise levels. 45# steel material significantly improves stability and longevity