Round base plate.

This is the bottom half of the base plate. It could be used as a universal mounting system if you attach a file for a nut, tube, another flange, etc to it with a CAD program. 123D Design was used to modify it. The size is easy to change as well. Use it for mounting your next project to a piece of wood, plastic, shelf, desk, workbench, wall, floor, ceiling, door, etc.