Much like the 545404, this mount also has threaded holes on the legs. However, those holes span a larger distance in order to align with the Actobotics 1.5" hub pattern (measuring 1.061" across the side). The remaining pattern on the face is 0.75" from the bottom surface and is a mix of threaded and thru-holes for versatility. General-use mounts such as this one are great to have handy when setting out to bring concept to reality.