This set of drills is not as strong as I imagined. I mainly use it to trim the protruding places after welding. After using it a few times, I found that the teeth of one of the drills are deformed. It still works though, so it's still a good product, at least it did my job.
It makes displaying my mini brands that are just the small card stock boxes easier, no glue needed for how I use them.
I needed to widen the holes in a door frame columns for my shop so I could get it square. The base plate is 1/4" thick steel. Nothing I had small enough, strong enough or aggressive enough to fit in the holes and widen them. So I ordered a plasma cutter! But the shipping got delayed. So I ordered these not having much hope they would be any good. Well, I was certainly wrong. I through the bit on my Dremil and in about 8 minutes 8t had chewed through roughly 1/4" of metal with no sign of slowing down. I don't know how long they will last but for the price they are doing great.
These thigs work pretty well! Yeah they arent stainless but unless you are in an extreme environment who cares! Used them on a butcher block top to make a workbench. I did this so I could remove the top and reattach without worrying about blowing out the holes if I need to break it down. I used a 3/8" drill but and a depth control collar on my drill to make sure they went in the right depth. I know others mentioned using either slightly smaller or bigger, after doing some trials 3/8 worked best for me, much smaller and they didnt want to catch a thread, bigger and you risk stripping out the hole. I did make a smaller pilot hole for the larger bit so it didnt drift and it worked great! Driving them in with the supplied hex key worked well, if you have hex bit aoxkets might be a bit easier on your hand. I would recommend these again to someone who is future proofing a project!