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 angle gauges that fits in any of the drawers that is at least 6u high. This model does not actually contain the angle gauges themselves, they can be found here. The model includes 3 different sizes, 1x2x6u, 1x2x8u and 1x2x10u.
Please have a look at the assembly model(here) for more information