Review on YUMORE L Brackets Heavy Duty, 5X3X1.8 Inch Stainless Steel Shelf Brackets Wall Mounted For Floating Shelves Industrial Farmhouse, Includes Hardware, Pack Of 4 by Mike Davis

I cannot believe how strong these brackets are. I ordered stainless steel brackets because I was using it in my engine bay to mount an oil catch can. I didn't fully expect them to be stainless steel because of how inexpensive they were. They are very much stainless steel. Perhaps the strongest metal I have ever worked with. I tried for over an hour to drill a hole through One of these with a brand new set of bits, and two different drills (an 18-volt Ryobi and a 20-volt DeWalt). Eventually I just gave up. The photos shown are of the absolutely obliterated set of bits from trying to get a hole through these brackets and the hole that never was on the bracket. I even tried drilling it from the other side once I had a hole going. No dice. These things are pretty incredible, if you need strong stainless brackets, these are the ones.PS. I ended up using the hole on the bracket to drill a new hole into the catch can's bracket, which was aluminum. That was easy as pie.