The Staedtler Noris Club double-hole triangular tub sharpener features 2 holes for different sized pencils. The double hole design lets you sharpen pencils with a standard 8.2 mm diameter as well as larger 10.2 mm pencils, and works equally well with graphite and crayon. The sharpener uses two different sized holes to ensure that both large and small pencils can easily be sharpened. One hole suits standard-sized blacklead pencils, using a narrower sharpening angle to help produce fine, accurate lines. The larger hole suits thick blacklead and coloured pencils, and aids in creating soft, thick lines. This sharpener uses a hinged cover for the holes which ensure that no pencil shavings spill over and no extra mess is created. The lid has a safety lock which means that you can carry the sharpener around without any spillage. The box contains 10 Staedtler Noris Club double-hole tub sharpeners. Perfect for schools and colleges or can also be very useful at workplace.