Stainless steel hardware included.
Important: These brackets can be found at your local hardware store. Commonly known as "conduit hangers", they're used by electricians to attach electrical conduit to walls. While they're not specifically made for bicycles, their size, design, and easy availability make them perfect. I'm telling you this so that you won't feel dumb when your electrician neighbor says, "Hey man, those are conduit hangers".