I use this resizing the laser cut holes to exactly 1/2 inch for the build I'm building - the size is right and it fits for this job. I've used it by hand and in low speed hand drills - but to be honest I wouldn't use them in a drill if I was rolling metal - I'm basically scraping the powder coating off a 1/2 inch laser cut hole - so I don't exactly cut I forgive a lot of metal with this thing. I'm giving it 4 stars as it's cheap and works, but I'm not sure I'll toss it in my grinder and use it. The fit and finish leaves a lot to be desired but a good US made reamer will cost a lot more but for the price - I'd give it a try.