Wow I can't believe these bits are junk. I'm confused that so many reviewers think these things are good. I suspect they don't know what a good step drill is. I assume people use them on easily drillable materials like plastic or plexiglass, but if you intend to use them on metal, don't buy them. Spend your money on a real step workout like Dewalt or Milwaukee. This is what I've used in the past and decided to buy a much cheaper set and boy do I regret it. I'll spend my money on a real set from Dewalt again. This is complete garbage for all metal applications.