Floating or Hidden Shelf Bracket PAIR - High Strength, Superior Quality, Machine Shop Made with Back-Side Post. These are the Cadillac of automobiles, er, shelf brackets. Tight tolerances, machined welds, high strength 1018 steel will hold up just about anything you need. Sure, there are cheaper options out there. But, you know, they're cheaper. Is that for a reason? These hidden shelf brackets cost what they cost because of the work I put into each one of them. These are for my discerning clients who like to put things on their floating shelves made of quality reclaimed wood. These brackets have been stress-tested to well over 100lbs per pair with proper install (if you aren't confident, consult a professional)