Have you ever had the core of the lead break when sharpening your pencil? Core of the lead breakage happens because of the force applied to the core by the wobbling (vertical & horizontal movement), excessive pushing or a blunt blade. Since the core breaks in the wood, it is suspected that it was broken from the beginning. With a good quality pencil, the core will not break in the wood even if you drop the pencil or step on it. With this innovated KITA-BOSHI pencil sharpener "634" you will never have these issues. This professional pencil sharpener comes with 2 built-in blades, one to shave the wood, and the other blade is used to sharpen the core. This 2-step process reduces the force required to sharpen the core and minimizes the wobbling. Also, by shaving the pencil in two steps, the force is reduced to about half, so even children can easily sharpen their pencils with minimized wobbling. Furthermore, since the wood becomes narrower, the fulcrum when sharpening the core will be closer to the tip, reducing the force applied to the tip even if the pencil wobbles. As a result, the core is less likely to break in the wood. Designed so that you can see your pencil tip as you are shaving so that you have complete control of when to stop and how sharp you want your lead to be. This manual pencil sharpener has a large container for capacity to store an entire pencil shaving. Handy portable pencil sharpener is made to accommodate three pencil sizes: dia. 7mm, 8mm and 10mm.