I used one from another manufacturer before purchasing this item, but the blade length has broken easily and long. As I looked it up on the Internet, I recommended this product, so when I tried it, I could not break it at all and my spaspa and holes were empty.
After purchasing 2 packs, we used about 2 pieces, but even if you are careful with chucking to the machine you will get a blur when you rotate. I think that the drill is warped. I am sorry just because there is no problem with sharpness.