- Easy to use: A rolling knife made of abrasion-resistant and durable alloy steel provides a sharp edge for effortless sharpening and labor-saving results. Ideal for students, artists, professors, engineers and architects, it makes writing, drawing and painting easier. - Adjustable pen tip thickness: Five different pen tip diameters to meet diverse needs. To sharpen pens at different thicknesses, simply turn the setting button on the rear handle. Suitable for pens of shapes such as triangular, hexagonal and round. - Automatic design with auto feeding: The pencil sharpener uses an automatic pen feeding design and allows the pen to be installed directly for sharpening. It suits standard pens with a diameter of 6.5-8 mm and is not recommended for soft core pens. The built-in spring automatically positions the pen to reduce end breakage. - Automatic end breakage protection: A tip extraction hole between the steel rolling knife and the shaft prevents end jams. If an end breakage occurs during sharpening, it is automatically removed to prevent blockages from broken ends. - Large-capacity dust box: Equipped with a large-capacity sawdust box that holds a substantial amount of pencil shavings, reducing the need for frequent unloading and saving time. - Compatibility and notes: Compatible with standard pens 6.5-8 mm in diameter; not suitable for soft core pens. Five adjustable tip diameters accommodate different shapes and line weights. - Practical use scenarios: - In a classroom or workshop, quickly sharpen pencils to a consistent tip for tidy notes and sketches. - In an art studio, vary tip thickness to achieve different line weights for drawing and shading. - On site for engineers or architects, sharpen pens of various shapes to prepare clear, precise technical drawings.