Stainless steel brackets and screws. On the matte side is a protective plastic with embedded holes. Looks good on the matte side and yes something like PITA to get the plastic off. I see a number of reviews saying they look used or have a crappy finish, it's protective plastic. But for the record, they're 0.037. " thick.
π© Teenitor 40mm x 40mm Stainless Steel Bracket Mounting Fastener
7 Review
Stainless Steel Bracket Shelves: Industrial Hanging Hardware
8 Review
π§ Boeray Stainless Steel Straight Brackets Mending: Durable and Versatile Support Solution
8 Review
Stainless Fastener Bracket for Furniture Bedframes
8 Review