Mobius & Ruppert Quattro Swing Sharpener for Lefties, Double-Hole. A crisp, sharp point makes a world of difference whether you are working on a technical drawing, writing a letter or creating a work of fine art. This snap-cap sharpener features a double-hole wedge any pencil in your sketch box! The 7.8mm hole is for standard pencil diameter and point-taper while the larger 11mm hole works well for careful sharpening of charcoal, pastels and colored pencils. The compact square shape can be easily gripped in the hand, while a transparent chamber ensures hassle-free sharpening with no mess to clean up.