Heavy Duty Stainless Steel Flat Mending Plate (2 Pieces)

I used these flat steel plates to reinforce the corners where the 2x4 sections of my desk frame meet. They tie the two frame pieces together and add extra stability without adding a bulky bracket or taking up much space underneath the desk.
 
They’re a simple, inexpensive way to strengthen a custom desk or workbench frame while keeping everything clean and low-profile.