This a little corner bracket for putting on internal faces. Ideal for light-duty shelving and generally fixing two sheets of wood or MDF in a T-shape. It is a compact design which tucks right in the corner. Fits with 3 x 3mm diameter countersunk wood screws. Use at least 2 per side.
Not suitable for non-countersunk fasteners.
Make sure you orient the teardrop-haped hole when printing so that the apex of the teardrop points up.