Review on 💪 Unleash Hard Steel Durability with KnKut Performance 5KK9 by Brian Samaiyar

The manufacturer claims that these drills will drill through hardened steel, including easily broken holes. I have a set and I will tell you that the claim is 100% correct. I just want them to sell them individually. I mostly use the size in the middle and apply it all over. Given the hassle of working through broken faucets and simple exits, I think it's worth the price of the entire set even though I only need one of the bits!