Modular Bracket for Plugable 7 Port USB3 Hub

Stack your USB3 hubs with this system of modular, interlocking brackets.
The base bracket features convenient holes for #6 screws. Then use the pins to stack middle brackets, and secure the whole thing with the top piece.

These brackets are for Plugable's USB3 Hub7 81x
http://plugable.com/products/usb3-hub7-81x

Here's a bit more on the design:
http://plugable.com/2015/07/30/adventures-in-stackability-and-modularity