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© N100 792 National Hardware Plated Holder
8 Review
π§ Boeray Stainless Steel Straight Brackets Mending: Durable and Versatile Support Solution
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Stainless Fastener Bracket for Furniture Bedframes
8 Review
π© Enhanced Durability and Stability: Outside Joining Aluminum Profile Bracket
8 Review