Nitram charcoal and graphite sharpener 8x23cm This charcoal sharpening block is ideal for shaping and sharpening charcoal and other drawing materials such as graphite. Features a sandpaper surface and a beech wood handle. Can be used to obtain powdered charcoal by sanding them with the tool. An additional set of replacement ear pads is included. Size 8 cm x 23 cm. Brand: Nitram.