Ah, that's some kind of shelving strut.
Check out unistrut. It's not L shaped, but it has holes so you can bolt it together.
I think Home Depot even sells it in the electrical section.
If not, check out a local electrical supplier like Stone Way Electric.
Keg #1: Brown Bomber Bourbon/Oak Vanilla Porter
Keg #2: The Bollocks ESB
Keg #3 Lawnmower APA
Bottled: Mjolnir Mead, Lazy Daze Hefe.