This is a standard right-angle-style shelf bracket with two screw/bolt holes per side. It was produced for use in a video on the DrVAX youtube channel and is fully customizable.

Added version 1.01 which calculates the placement of the screw holes using percentages instead of fixed positions. Added some color just for the fun of it.

Updated to version 1.03 which has some additional refinements, specifically at the suggestion of a YouTube viewer I added a cutout in the diagonal brace to allow you to use a screw driver more easiely.