I ordered these to drill some 1/4 inch holes in a metal frame I'm making for a table. I've worn and broken 3 drill bits and barely drilled a few holes. I ordered these for the price and time to complete the order and I actually only used two of these to drill the remaining holes (using two separate drill bits. Not because one broke). It cuts through metal with no problem. Now I have some extra baits and it's great. I usually use 1/4" screws to make things, so this works pretty well.