connector for IKEA lack enclosure extension

ATTENTION: if you are attaching a bottom plate like shown in the picture, do assemble the tables individually first. Then attach with connectors! Otherwise, it will become extremely difficult (or impossible) to install with dowel screws (double-side screw) between legs and table tops.

To achieve the best look, drill bottom plate through existing holes with 3/16" or 4.8 mm drill bit. Then attach the legs so the painted part is facing up.
This way, 4 Wheel Casters can be installed to the bott