This stencil (or template) is used to locate and mark the location on a project box for adding a C14 power inlet socket (this is the female socket typically used for standard computer AC power cables). To use the template simply place it on your project box at the desired socket location and mark the opening and mounting hole locations with a felt tip pen - then get to work with drilling and filing (unless you are fortunate enough to have a C14 knock-out punch).
Also included is a "dummy" socket which can be used to test fit the opening and hole locations.
The OnShape 3D CAD files for this can be found here:
Print in PLA flat side down, 15% rectilinear infill.
The author marked this model as their own original creation.