Before purchasing, I had deburred with a cutter knife, but there was a case that I could not do it beautifully because the blade cut into it. Using a deburring knife, deburring was easy and beautiful. I am satisfied with the feeling of use. However, there is no description of usage etc. in the package. Three types of replacement blades are attached, but we do not know how to use it. I did not understand how to distinguish it even at the product page of your replacement blade. According to the product information on the manufacturer's Web page, it looks like the following. K-35-1 Replacement Blade (Black / Single Edged) Steel K-35-2 Replacement Blade (Silver / Double Edged) Plastic K-35-3 Replacement Blade (Black / Double Edged) I think that it will be easy to identify and purchase if the replacement blade and the above application and appearance are also described as barriation.