This is an adjustable foot for 40 mm T-Slot aluminium extrusion. It was design, especially for a 3D printer. It can serve other purposes obviously.
You will likely need 4 feet, 2 right and 2 left supports. Furthermore, you will need four threaded rods of either 8mm or 5/16" in diameter. They must be at least 50 mm length. Finally, to be able to assemble the feet, you will need to thread the supports and the feet.
The author marked this model as their own original creation. Imported from Thingiverse.