Review on Black External Chamfer Deburring Tool Pack by Jason Gopinath

I read the reviews about it and liked the products but I wasn't sure what I was getting. Well a project came up and I needed to use them. I put it in the drill and gave it a light squeeze and it did a great job. I deburred 1/4 of the screws that go all the way down, so this really is the smallest size. But he did exactly what he promised. I only made 8 grade 5 bolts so I don't know if they cut grade 8 steel or stainless steel or how many times you can use them. But for that kind of cost, if they get boring I'll just buy another set.