These snap-cap sharpeners have a compact square shape that can be easily gripped in the hand. The single-holed sharpener works well for lead pencils, while the double-hole wedge is ideal for all pencils in the artists sketch box including larger diameter art pencils. The smaller 7.8mm hole is for standard pencil diameter and point-taper. The larger 11mm hole works well for careful sharpening of charcoal, pastels and colored pencils. The blade may be replaced with MG100-0050.