It's my first time ever heard about this kind of tool, The deburring tool. Thanks to my handyman hubs, he explains it to me. Basically, when you cut a metal it will deburrs all pieces of metal to a rounded edges. In other words to contour the sharp blades of metal and whatsoever. This piece looks really simple yet so useful. They have different looks depends on your preferences. Definitely he needs one soon then for his present project.