The Actobotics X-Rail extrusion compliments the already extensive building system. The ‘X’ profile provides a slot in the center of each of the four sides to capture X-Rail Mounts and solidly fasten components anywhere along the rail. While that would exhaust the ingenuity of other brands of extrusion, the Actobotics X-Rail has other key features that increase the versatility. The corners have been radiused so that the X-rail has a 1″ diameter – this means you can install it into a 1″ bearing and use it as an axle or you can even use 1″ clamps to fasten components at any point along the rail and at any angle. The 3/8” bore can be used as a passage for shafting, threaded rod, or routing wires but it can also be used to locate a 3/8″ OD ball bearing in order to create a rotating assembly. Dimensionally, the X-Rail is exactly half the size of the channel so that the geometry remains correct for expanding your assembly with additional Actobotics parts.