A machine mount for the bosch belt sander. Put it in a hole of your working bench and clamp it. You also can secure it with a M8 bolt and a printable thumbwheel (you will find that on thingiverse ;-) ). It has also a hole to mount a machine stop. You will need two M4 bolts to mount it to the sander. Maybe I desing a printable one in the future. And yes it fits perfectly in the machine case.