Hi. I am very pleased with this recent purchase, however it wasn't without flaws so I couldn't give a perfect score. This last Knife Blade and Drive Housing did complete the project, however a small tip of the housing blade did come off. It did leave a small metallic smear on the project, but it did not completely break off.  I have not attempted a new project after completing this last one recently but I am hopeful I will get a successful cut with the knife blade.