This model allows you to stack 7cm x 9cm protoboards, M2 screws and nuts are required to mount the protoboard
It is a push fit system, with a hollow space between the pillar so that a M3 screw can be used to secure the stack.

When stacked the distance between the protoboards is 11mm, this is the height of my female and male header's combined hight

 The M3 mounting holes have a distance of 50mm x 70mm.

This model is part of a collection of stackable mounts.

See here: [https://makerworld.com/en/collections/6179802-stackable-mounts](https://makerworld.com/en/collections/6179802-stackable-mounts)