Made of high-quality metal, this Mars sharpener features two holes for double the sharpening power. Use the small hole for standard-sized black lead pencils up to 8.2 mm, allowing a sharpening angle of 23 for clear and accurate lines. Use the larger hole for thick black lead and coloured pencils up to 10.2 mm, allowing a sharpening angle of 30 for broad, soft lines. All Mars sharpener inserts are made out of die-cast zinc which guarantees stability, precision and an exceptionally long service life. An essential tool for the office, school or studio.