4pcs Shelf Bracket Heavy Duty Black Steel 90° L Corner Brace, Decorative Joint Angle Bracket for Shelf 5 InchX3 Inch Shelves Wall Hanging Bracket with Screws(6 hole/p) - Walmart.com
Wideskall Metal 6" x 8" inch Wall Corner Angle Shelving Shelf Brackets, White, Pack of 4 - Walmart.com
Steel Shelf Support J Bracket for Floating Shelves Bolts - Etsy New Zealand
Simple Floating Corner Shelf - No Specialist Hardware Or Fixings - YouTube
Everbilt Fixed Mount Steel Corner Shelf Support Bracket 90198 - The Home Depot