Built on our 25 mm optical rail standard, Thorlabs offers a selection of off-the-shelf and DIY custom enclosure options for protecting experiments performed on our standard solid aluminum breadboards. Our 25 mm, 50 mm, and 75 mm aluminum optical rails and associated accessories (corner cubes and brackets, T-nuts, low-profile channel screws, rail joiners, etc.) can all be used to build three-dimensional structures or custom enclosures of varying sizes, from smaller breadboard enclosures to larger optical table enclosures.