The best pencil sharpener in the world for an Architect, Designer, Sketcher, professional or not. It has 2 stages but you can use only one if the tip is not very damaged. It also has 2 sharpeners for 2mm and 3.15mm lead holders, as well as 2 extra blades. I don't remember when I got it, it's definitely been 2 years and I still haven't needed to change the blade because it works like the first day. It has never broken the tip of any pencil. It has a transparent door, so the shavings don't fall and I like that more, especially when sharpening 2mm/3.15mm because I keep the graphite in Depon effervescent tablet tubes! It's very expensive to buy graphite in powder form, so it's a waste to throw it away when you can have it for free. If you don't have a VERY heavy hand when writing, then it's also suitable for those who use pencils mainly for writing. It will keep the tip for much longer before needing to be sharpened again. You won't be disappointed, it's incredible in quality, results, flexibility, and durability! You just need to know how to use each tool correctly, and I mention this because usually everyone uses sharpeners wrong, with the most common mistake being not stopping frequently to check and sharpening more than necessary, resulting in the tip breaking as soon as you use the pencil or breaking inside the sharpener, which is even worse because you will have to disassemble the blades to remove the broken piece.