Description The Mobius & Ruppert Brass Round Double Hole Sharpener features two pencil diameters, making this an ideal sketch box staple. The smaller hole measures 7.8mm for standard pencil diameters and forpoint tapering. The larger hole measures 11mm and is perfect for sharpening charcoal, pastels, and colored pencils.The trademark of Mobius and Ruppert sharpeners is quality. They produce all the pencil sharpener blades themselves in Erlangen, Germany and the sharpeners are suited for every type of wood and pen - reliable and clean. A special corrosion protection guarantees a long life expectancy.Very popular with design professionals and artists, the M and B brass sharpeners represent a "heavy" alternative for individualists. Built for heavy-duty use, these brass pencil sharpeners from Mobius & Ruppert are virtually unbreakable.