Electric Coffee Grinder Coffee Bean Grinder USB Charge Stainless Steel Espresso Spice Mill GrindersProduct Feature: 1. CNC 420 stainless steel 5 angle grinding core,which will not be broken or rough like ceramic grinding core. 2. High performance motor. The maximum torque is 35kg cm, it will not stuck beans and the noise is only 55dB. It only takes 40 seconds to grind about 15g coffee beans(regular thickness). 3. Bold double bearing design. The concentricity is stable, and there will be no problems such as extremely uneven grinding or even shaking.