This is a 2020 3 way corner brace. I made this brace specifically to eliminate the need to cut the corners off of Plexiglas when building Knickohr's 3d printer enclosure. The knockouts on the cube are where the glass would have hit if using a solid piece.

Screw holes are designed to fit m5 flat screws. Recommend using 10mm length screws to attach to the frame.