Easy to use: Earned with a rolling knife made of abrasion -resistant and durable alloy steel, and has a sharp edge for effortless and labor -saving pencil. Ideal for students, artists, professors, engineers and architects, makes it much easier to write, draw and paint. Adjustable pen tip thickness: This class is the pencil pencil, to create five different pen tip diameters to meet all your needs. To sharpen the pens in different thicknesses, just turn the setting button on the rear handle. Suitable for pens of different shapes such as triangle, hexagon and round. Automatic Design: Manual Pencil Pentenance adopts automatic pen feeding design and allows the pen to be installed directly to sharpen. Suitable for various standard pens with a diameter of 6.5-8 mm (not recommended for soft core pens). The built -in spring automatically adjusts the pen location and reduces the end breakage. Automatic end breakage design: This colored pencil has a tip extraction hole between the steel rolling knife and the shaft to prevent the end jams. If the end breakage occurs during sharpening, it is automatically removed and the blockages caused by the broken ends are prevented. Large -capacity chip box: This child's pencil is equipped with a large -capacity sawdust box that can hold a large amount of pencil shavings at the same time, which eliminates your frequent unloading need and saves you time.