This is a bracket that is specific to the extrusion of my 40x11 LED matrix. They wrap around back to curl under and hold them conformed to the body no matter the angle. The display comes with some little dog-ears that are meant to be attached to a chain and hung straight down. I need to mount to an angled wall though so I designed these to fit snugly in the extrusion and 4 of them hold it just fine. Honestly three would be ok too.