4040 Extrusion Corner Bracket Spacer

A 4040 extrusion brackets can be rotated 90 degrees on the aluminium extrusion, for example, to fix a table top to a frame made with extrusions. When rotated, the angle bracket has lugs that no longer align with the extrusion slots. Either you have to cut the lugs off the bracket or you can use a spacer between the bracket and the extrusion to make a good fit. That is the purpose of this spacer.