This is an Acrylic Holder. It can ensure the security of your demoboard and avoid placing the demoboard on the desk freely to cause short cut. The Acrylic Holder also simplifies your experiment when you are building a complex circuit. There are three zones on the Acrylic Holder and each has a name on it. We have made some slots in the zone that used to fix the Raspberry Pi to make the use more comfortable.
A screwdriver is provided for you to install the Raspberry Pi and for Arduino board onto the holder with screws.  

Package List:
1x Acrylic Holder
1x Cross Screwdriver
10x M2.5 Nut
10x M2.5*4 Screw
10x M2.5*4+6 Copper Pillar