The unique two hole style is a distinctive emblem of taste for discerning creative people. It is ideal for all pencils in the artists' sketch box including large diameter art pencils.  The small hole (7.8mm) is for a standard pencil diameter and point  taper. The large hole (11mm) is perfect for careful sharpening of  charcoal, pastels and colored pencils. To assure a good cut, blades  should be changed often. The replacement blade is MG100-0050.