Spice Rack Corner Braces
thingiverse
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/77KCr4f5uF2 Brackets are designed to accept 1/4" (6mm-6.35mm) material, these were specifically designed for wood, so I could make a pullout spice rack for my cabinets, but would be usable with other materials that meet thickness.
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