3 Rotational Speeds are Selectable (LOW, MEDIUM, HIGH) Select the appropriate rotational speed according to the material of the knife. 3-Stage Sharpening System (Crude, Fine, Polish) 100% diamond grinding wheel (Electric) in slot 1 and slot 2, restores the sharpness of the blade, ceramic polishing rod (Manual) in slot 3 for polishing. 32.5 Degree Slot (left and right) (suitable for bone cutting knife, sushi knife) Pull out the baffles. The slot angle is enlarged to 32.5 degrees. Suitable for bone cutting knife, sushi knife, etc. Multi-Function Electric Scissors Slot Pull the cover upwards to restore the sharpness of the scissors blade. In addition, it can sharpen other tools such as garden scissors, axes, etc.