FOSBOS is an completely free organizational system, every model is open sourced including both fusion 360 file and the step file. All the drawers are designed after the gridfinity standard.
This model is a bin for storing your Bed Knob and AMS Disconnecting tools that fits in any of the drawers that is at least 4u high. This model does not actually contain the Bed Knob and AMS Disconnecting tools themselves, they can be found here and here. This model only contains gridfinity bins to store your your tools inside your FOSBOS.
There are 4 different bins, 1x1x4u, 1x1x6u, 1x1x8u and 1x1x10u.
Please have a look at the assembly model(here) for more information