Custom slide in breadboard circuit board design. Heavy 1/4" top and bottom aluminum plate, with easy access removable top and bottom, black anodized, hook up wires can be soldered directly to the circuit board to eliminate connectors (look at front and please notice the horizonal 1/8" openning in the front for wires) - cool design.

The box size:  a) The outside measures: 10 1/4" Wide x 6" 5/16" Deep x 3" High

                        b) The inside measures: 7 1/8" Wide x 4 1/8" Deep x 2 1/2" High

                        c) The inside track 1/16"  - 3/4"space from the inside case bottom to the track.

The box is super high quality - weighing a massive 10 lbs for a small box.