Common accessories for solid aluminum optical breadboards are rubber mounting feet and lifting handles. Base Lab Tools has made these readily available at an economical price.
Rubber mounting feet keep the breadboard off of the mounting surface and make it easier to reach underneath to lift and move. These rubber mounting feet for optical breadboards additionally provide some dampening from external vibrations.
Lifting handles are used to attach to the top of the breadboard so it can picked up from a flat surface.