This Carl rotary pencil sharpener has a sleek finish and is perfect for sharpening standard and jumbo size pencils with a diameter range of 8 mm to 11mm. Carl CP300 sharpener will automatically draw pencils in and stops sharpening when the desired tip is achieved. It features quiet operation and comes with a desk clamp. The internal gear is made of durable zinc die-cast for long service life. Suitable for all pencil sizes between the diameter of 8-11mm.